We can configure the network interfaces on a Linux machine by editing text files stored in the /etc/sysconfig/network-scripts directory.
Illustration:
Network address: 10.145.72.0
Subnet mask : 255.255.254.0 i.e. /23
Primary network interface: eth0 10.145.72.65
Default gateway: 10.145.72.1
Broadcast address: 10.145.73.255
Another interface: eth1 172.16.75.12
Subnet: 255.255.255.0 i.e. /24
Broadcast: 172.16.75.255
Ensure you have the DNS server(s) configuration information in place:
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / > cat /etc/resolv.conf
search us.company.com
nameserver 120.25.237.31
nameserver 120.25.237.52
nameserver 172.125.82.122
nameserver 133.20.170.70
tabletop.us.company.com: / >
Also makes sure you have entered the default gateway information in the file shown here:
tabletop.us.company.com: / >
tabletop.us.company.com: / > cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=tabletop.us.company.com
GATEWAY=10.145.72.1
NISDOMAIN=nis-company
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
Edit the network interface configuration files as shown here:
tabletop.us.company.com: / >
tabletop.us.company.com: / > cd /etc/sysconfig/network-scripts
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > vi ifcfg-eth0
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > cat ifcfg-eth0
# Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
NM_CONTROLLED=no
HWADDR=00:1C:68:47:CA:40
IPADDR=10.145.72.65
NETMASK=255.255.254.0
GATEWAY=10.145.72.1
NETWORK=10.145.72.0
BROADCAST=10.145.73.255
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > vi ifcfg-eth1
tabletop.us.company.com: /etc/sysconfig/network-scripts > cat ifcfg-eth1
# Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper)
DEVICE=eth1
BOOTPROTO=static
HWADDR=00:1C:68:47:CA:41
ONBOOT=yes
HOTPLUG=no
IPADDR=172.16.75.12
NETMASK=255.255.255.0
NETWORK=172.16.75.0
TYPE=Ethernet
USERCTL=yes
IPV6INIT=no
PEERDNS=yes
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > cd /
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
Restart the network service so the changes take effect:
tabletop.us.company.com: / >
tabletop.us.company.com: / > service network restart
Shutting down interface eth0:
[ OK ]
Shutting down interface eth1: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
Bringing up interface eth1: [ OK ]
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / > ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:1C:68:47:CA:40
inet addr:10.145.72.65 Bcast:10.145.73.255 Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1826048 errors:0 dropped:0 overruns:0 frame:0
TX packets:461001 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:321564798 (306.6 MiB) TX bytes:151015465 (144.0 MiB)
Memory:fcae0000-fcb00000
tabletop.us.company.com: / >
tabletop.us.company.com: / > ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:1C:68:47:CA:41
inet addr:172.16.75.12 Bcast:172.16.75.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:440013 errors:0 dropped:0 overruns:0 frame:0
TX packets:170774 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:66945052 (63.8 MiB) TX bytes:9519723 (9.0 MiB)
Memory:fcac0000-fcae0000
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / > route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.75.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
10.145.0.0 0.0.0.0 255.255.254.0 U 0 0 0 eth0
172.31.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
0.0.0.0 10.145.72.1 0.0.0.0 UG 0 0 0 eth0
tabletop.us.company.com: / >
tabletop.us.company.com: / >
Note: If you make changes to a specific network interface file, say ifcfg-eth0, you can bring the changes into effect, without running the "service network restart" command. You can run the two following commands:
# ifdown eth0
# ifup eth0
Configuring IPv6 on two servers and getting them to ping each other:
Server 1
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=pqr923.us.company.com
GATEWAY=10.145.120.1
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2616:d413:418:7f39::1
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > vi /etc/sysconfig/network-scripts/ifcfg-eth0
pqr923.us.company.com: / > cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=96accc42-9e23-4170-9af1-ea52cfe7cc9e
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
HWADDR=00:37:38:8E:0D:74
IPADDR=10.145.120.175
PREFIX=23
GATEWAY=10.145.120.1
DNS1=175.75.139.82
DNS2=185.50.120.10
DNS3=195.165.32.172
DOMAIN=us.company.com
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
NAME="System eth0"
IPV6INIT=yes
IPV6ADDR=2616:d413:418:7f39:4000::923
IPV6_DEFAULT=2616:d413:418:7f39::1
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:37:38:8E:0D:74
inet addr:10.145.120.175 Bcast:10.145.121.255 Mask:255.255.254.0
inet6 addr: 2616:d413:418:7f39:4000::923/64 Scope:Global
inet6 addr: fe80::221:27ff:fe8e:d34/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:41284 errors:0 dropped:0 overruns:0 frame:0
TX packets:6229 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2654091 (2.5 MiB) TX bytes:747366 (729.8 KiB)
pqr923.us.company.com: / > ping6 2616:d413:418:7f39:4000::923
PING 2616:d413:418:7f39:4000::923(2616:d413:418:7f39:4000::923) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=1 ttl=64 time=0.045 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=2 ttl=64 time=0.027 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=3 ttl=64 time=0.027 ms
^C
--- 2616:d413:418:7f39:4000::923 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2446ms
rtt min/avg/max/mdev = 0.027/0.033/0.045/0.008 ms
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > ping6 2616:d413:418:7f39:4000::924
PING 2616:d413:418:7f39:4000::924(2616:d413:418:7f39:4000::924) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=1 ttl=64 time=2.26 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=2 ttl=64 time=0.189 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=3 ttl=64 time=0.184 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=4 ttl=64 time=0.183 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=5 ttl=64 time=0.182 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=6 ttl=64 time=0.181 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=7 ttl=255 time=0.183 ms
^C
--- 2616:d413:418:7f39:4000::924 ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 6654ms
rtt min/avg/max/mdev = 0.181/0.480/2.262/0.727 ms
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > traceroute6 2616:d413:418:7f39:4000::924
traceroute to 2616:d413:418:7f39:4000::924 (2616:d413:418:7f39:4000::924), 30 hops max, 80 byte packets
1 2616:d413:418:7f39:4000::924 (2616:d413:418:7f39:4000::924) 0.151 ms !X 0.146 ms !X 0.167 ms !X
pqr923.us.company.com: / >
pqr923.us.company.com: / > route -n -A inet6
Kernel IPv6 routing table
Destination Next Hop Flags Metric Ref Use Iface
2616:d413:418:7f39:4000::924/128 2616:d413:418:7f39:4000::924 UC 0 20 0 eth0
2616:d413:418:7f39::/64 :: U 256 0 0 eth0
fe80::/64 :: U 256 0 0 eth0
::/0 2616:d413:418:7f39::1 UG 1 0 0 eth0
::1/128 :: U 0 15 1 lo
2616:d413:418:7f39:4000::923/128 :: U 0 163 1 lo
fe80::221:27ff:fe8e:d34/128 :: U 0 16 1 lo
ff00::/8 :: U 256 0 0 eth0
pqr923.us.company.com: / >
pqr923.us.company.com: / >
Server 2
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=pqr924.us.company.com
GATEWAY=10.145.120.1
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2616:d413:418:7f39::1
pqr924.us.company.com: / > cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=96accc42-9e23-4170-9af1-ea52cfe8da9e
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
HWADDR=00:37:28:8F:0D:48
IPADDR=10.145.120.176
PREFIX=23
GATEWAY=10.145.120.1
DNS1=175.75.139.82
DNS2=185.50.120.10
DNS3=195.165.32.172
DOMAIN=us.company.com
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
NAME="System eth0"
IPV6INIT=yes
IPV6ADDR=2616:d413:418:7f39:4000::924
IPV6_DEFAULT=2616:d413:418:7f39::1
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:37:28:8F:0D:48
inet addr:10.145.120.176 Bcast:10.145.121.255 Mask:255.255.254.0
inet6 addr: fe80::221:27ff:fe8e:d78/64 Scope:Link
inet6 addr: 2616:d413:418:7f39:4000::924/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:24737 errors:0 dropped:0 overruns:0 frame:0
TX packets:4151 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1629720 (1.5 MiB) TX bytes:512379 (500.3 KiB)
pqr924.us.company.com: / >
pqr924.us.company.com: / > ping6 2616:d413:418:7f39:4000::924
PING 2616:d413:418:7f39:4000::924(2616:d413:418:7f39:4000::924) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=1 ttl=64 time=0.045 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=2 ttl=64 time=0.027 ms
^C
--- 2616:d413:418:7f39:4000::924 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1990ms
rtt min/avg/max/mdev = 0.027/0.036/0.045/0.009 ms
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > ping6 2616:d413:418:7f39:4000::923
PING 2616:d413:418:7f39:4000::923(2616:d413:418:7f39:4000::923) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=1 ttl=64 time=1.99 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=2 ttl=64 time=0.183 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=3 ttl=64 time=0.185 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=4 ttl=64 time=0.179 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=5 ttl=64 time=0.187 ms
^C
--- 2616:d413:418:7f39:4000::923 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4749ms
rtt min/avg/max/mdev = 0.179/0.546/1.999/0.726 ms
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > traceroute6 2616:d413:418:7f39:4000::923
traceroute to 2616:d413:418:7f39:4000::923 (2616:d413:418:7f39:4000::923), 30 hops max, 80 byte packets
1 2616:d413:418:7f39:4000::923 (2616:d413:418:7f39:4000::923) 0.783 ms !X 0.693 ms !X 0.593 ms !X
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > route -n -A inet6
Kernel IPv6 routing table
Destination Next Hop Flags Metric Ref Use Iface
2616:d413:418:7f39:4000::923/128 2616:d413:418:7f39:4000::923 UC 0 16 0 eth0
2616:d413:418:7f39::/64 :: U 256 0 0 eth0
fe80::/64 :: U 256 0 0 eth0
::/0 2616:d413:418:7f39::1 UG 1 0 0 eth0
::1/128 :: U 0 17 1 lo
2616:d413:418:7f39:4000::924/128 :: U 0 191 1 lo
fe80::221:27ff:fe8e:d78/128 :: U 0 21 1 lo
ff00::/8 :: U 256 0 0 eth0
pqr924.us.company.com: / >
pqr924.us.company.com: / >
Illustration:
Network address: 10.145.72.0
Subnet mask : 255.255.254.0 i.e. /23
Primary network interface: eth0 10.145.72.65
Default gateway: 10.145.72.1
Broadcast address: 10.145.73.255
Another interface: eth1 172.16.75.12
Subnet: 255.255.255.0 i.e. /24
Broadcast: 172.16.75.255
Ensure you have the DNS server(s) configuration information in place:
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / > cat /etc/resolv.conf
search us.company.com
nameserver 120.25.237.31
nameserver 120.25.237.52
nameserver 172.125.82.122
nameserver 133.20.170.70
tabletop.us.company.com: / >
Also makes sure you have entered the default gateway information in the file shown here:
tabletop.us.company.com: / >
tabletop.us.company.com: / > cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=tabletop.us.company.com
GATEWAY=10.145.72.1
NISDOMAIN=nis-company
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
Edit the network interface configuration files as shown here:
tabletop.us.company.com: / >
tabletop.us.company.com: / > cd /etc/sysconfig/network-scripts
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > vi ifcfg-eth0
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > cat ifcfg-eth0
# Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
NM_CONTROLLED=no
HWADDR=00:1C:68:47:CA:40
IPADDR=10.145.72.65
NETMASK=255.255.254.0
GATEWAY=10.145.72.1
NETWORK=10.145.72.0
BROADCAST=10.145.73.255
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > vi ifcfg-eth1
tabletop.us.company.com: /etc/sysconfig/network-scripts > cat ifcfg-eth1
# Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper)
DEVICE=eth1
BOOTPROTO=static
HWADDR=00:1C:68:47:CA:41
ONBOOT=yes
HOTPLUG=no
IPADDR=172.16.75.12
NETMASK=255.255.255.0
NETWORK=172.16.75.0
TYPE=Ethernet
USERCTL=yes
IPV6INIT=no
PEERDNS=yes
tabletop.us.company.com: /etc/sysconfig/network-scripts >
tabletop.us.company.com: /etc/sysconfig/network-scripts > cd /
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
Restart the network service so the changes take effect:
tabletop.us.company.com: / >
tabletop.us.company.com: / > service network restart
Shutting down interface eth0:
[ OK ]
Shutting down interface eth1: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
Bringing up interface eth1: [ OK ]
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / > ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:1C:68:47:CA:40
inet addr:10.145.72.65 Bcast:10.145.73.255 Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1826048 errors:0 dropped:0 overruns:0 frame:0
TX packets:461001 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:321564798 (306.6 MiB) TX bytes:151015465 (144.0 MiB)
Memory:fcae0000-fcb00000
tabletop.us.company.com: / >
tabletop.us.company.com: / > ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:1C:68:47:CA:41
inet addr:172.16.75.12 Bcast:172.16.75.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:440013 errors:0 dropped:0 overruns:0 frame:0
TX packets:170774 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:66945052 (63.8 MiB) TX bytes:9519723 (9.0 MiB)
Memory:fcac0000-fcae0000
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / >
tabletop.us.company.com: / > route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.75.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
10.145.0.0 0.0.0.0 255.255.254.0 U 0 0 0 eth0
172.31.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
0.0.0.0 10.145.72.1 0.0.0.0 UG 0 0 0 eth0
tabletop.us.company.com: / >
tabletop.us.company.com: / >
Note: If you make changes to a specific network interface file, say ifcfg-eth0, you can bring the changes into effect, without running the "service network restart" command. You can run the two following commands:
# ifdown eth0
# ifup eth0
Configuring IPv6 on two servers and getting them to ping each other:
Server 1
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=pqr923.us.company.com
GATEWAY=10.145.120.1
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2616:d413:418:7f39::1
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > vi /etc/sysconfig/network-scripts/ifcfg-eth0
pqr923.us.company.com: / > cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=96accc42-9e23-4170-9af1-ea52cfe7cc9e
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
HWADDR=00:37:38:8E:0D:74
IPADDR=10.145.120.175
PREFIX=23
GATEWAY=10.145.120.1
DNS1=175.75.139.82
DNS2=185.50.120.10
DNS3=195.165.32.172
DOMAIN=us.company.com
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
NAME="System eth0"
IPV6INIT=yes
IPV6ADDR=2616:d413:418:7f39:4000::923
IPV6_DEFAULT=2616:d413:418:7f39::1
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:37:38:8E:0D:74
inet addr:10.145.120.175 Bcast:10.145.121.255 Mask:255.255.254.0
inet6 addr: 2616:d413:418:7f39:4000::923/64 Scope:Global
inet6 addr: fe80::221:27ff:fe8e:d34/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:41284 errors:0 dropped:0 overruns:0 frame:0
TX packets:6229 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2654091 (2.5 MiB) TX bytes:747366 (729.8 KiB)
pqr923.us.company.com: / > ping6 2616:d413:418:7f39:4000::923
PING 2616:d413:418:7f39:4000::923(2616:d413:418:7f39:4000::923) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=1 ttl=64 time=0.045 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=2 ttl=64 time=0.027 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=3 ttl=64 time=0.027 ms
^C
--- 2616:d413:418:7f39:4000::923 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2446ms
rtt min/avg/max/mdev = 0.027/0.033/0.045/0.008 ms
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > ping6 2616:d413:418:7f39:4000::924
PING 2616:d413:418:7f39:4000::924(2616:d413:418:7f39:4000::924) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=1 ttl=64 time=2.26 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=2 ttl=64 time=0.189 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=3 ttl=64 time=0.184 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=4 ttl=64 time=0.183 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=5 ttl=64 time=0.182 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=6 ttl=64 time=0.181 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=7 ttl=255 time=0.183 ms
^C
--- 2616:d413:418:7f39:4000::924 ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 6654ms
rtt min/avg/max/mdev = 0.181/0.480/2.262/0.727 ms
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / >
pqr923.us.company.com: / > traceroute6 2616:d413:418:7f39:4000::924
traceroute to 2616:d413:418:7f39:4000::924 (2616:d413:418:7f39:4000::924), 30 hops max, 80 byte packets
1 2616:d413:418:7f39:4000::924 (2616:d413:418:7f39:4000::924) 0.151 ms !X 0.146 ms !X 0.167 ms !X
pqr923.us.company.com: / >
pqr923.us.company.com: / > route -n -A inet6
Kernel IPv6 routing table
Destination Next Hop Flags Metric Ref Use Iface
2616:d413:418:7f39:4000::924/128 2616:d413:418:7f39:4000::924 UC 0 20 0 eth0
2616:d413:418:7f39::/64 :: U 256 0 0 eth0
fe80::/64 :: U 256 0 0 eth0
::/0 2616:d413:418:7f39::1 UG 1 0 0 eth0
::1/128 :: U 0 15 1 lo
2616:d413:418:7f39:4000::923/128 :: U 0 163 1 lo
fe80::221:27ff:fe8e:d34/128 :: U 0 16 1 lo
ff00::/8 :: U 256 0 0 eth0
pqr923.us.company.com: / >
pqr923.us.company.com: / >
Server 2
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=pqr924.us.company.com
GATEWAY=10.145.120.1
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2616:d413:418:7f39::1
pqr924.us.company.com: / >
pqr924.us.company.com: / > vi /etc/sysconfig/network-scripts/ifcfg-eth0pqr924.us.company.com: / > cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=96accc42-9e23-4170-9af1-ea52cfe8da9e
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
HWADDR=00:37:28:8F:0D:48
IPADDR=10.145.120.176
PREFIX=23
GATEWAY=10.145.120.1
DNS1=175.75.139.82
DNS2=185.50.120.10
DNS3=195.165.32.172
DOMAIN=us.company.com
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
NAME="System eth0"
IPV6INIT=yes
IPV6ADDR=2616:d413:418:7f39:4000::924
IPV6_DEFAULT=2616:d413:418:7f39::1
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:37:28:8F:0D:48
inet addr:10.145.120.176 Bcast:10.145.121.255 Mask:255.255.254.0
inet6 addr: fe80::221:27ff:fe8e:d78/64 Scope:Link
inet6 addr: 2616:d413:418:7f39:4000::924/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:24737 errors:0 dropped:0 overruns:0 frame:0
TX packets:4151 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1629720 (1.5 MiB) TX bytes:512379 (500.3 KiB)
pqr924.us.company.com: / >
pqr924.us.company.com: / > ping6 2616:d413:418:7f39:4000::924
PING 2616:d413:418:7f39:4000::924(2616:d413:418:7f39:4000::924) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=1 ttl=64 time=0.045 ms
64 bytes from 2616:d413:418:7f39:4000::924: icmp_seq=2 ttl=64 time=0.027 ms
^C
--- 2616:d413:418:7f39:4000::924 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1990ms
rtt min/avg/max/mdev = 0.027/0.036/0.045/0.009 ms
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > ping6 2616:d413:418:7f39:4000::923
PING 2616:d413:418:7f39:4000::923(2616:d413:418:7f39:4000::923) 56 data bytes
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=1 ttl=64 time=1.99 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=2 ttl=64 time=0.183 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=3 ttl=64 time=0.185 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=4 ttl=64 time=0.179 ms
64 bytes from 2616:d413:418:7f39:4000::923: icmp_seq=5 ttl=64 time=0.187 ms
^C
--- 2616:d413:418:7f39:4000::923 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4749ms
rtt min/avg/max/mdev = 0.179/0.546/1.999/0.726 ms
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > traceroute6 2616:d413:418:7f39:4000::923
traceroute to 2616:d413:418:7f39:4000::923 (2616:d413:418:7f39:4000::923), 30 hops max, 80 byte packets
1 2616:d413:418:7f39:4000::923 (2616:d413:418:7f39:4000::923) 0.783 ms !X 0.693 ms !X 0.593 ms !X
pqr924.us.company.com: / >
pqr924.us.company.com: / >
pqr924.us.company.com: / > route -n -A inet6
Kernel IPv6 routing table
Destination Next Hop Flags Metric Ref Use Iface
2616:d413:418:7f39:4000::923/128 2616:d413:418:7f39:4000::923 UC 0 16 0 eth0
2616:d413:418:7f39::/64 :: U 256 0 0 eth0
fe80::/64 :: U 256 0 0 eth0
::/0 2616:d413:418:7f39::1 UG 1 0 0 eth0
::1/128 :: U 0 17 1 lo
2616:d413:418:7f39:4000::924/128 :: U 0 191 1 lo
fe80::221:27ff:fe8e:d78/128 :: U 0 21 1 lo
ff00::/8 :: U 256 0 0 eth0
pqr924.us.company.com: / >
pqr924.us.company.com: / >
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