SUMMARY
Steps needed to enable jumbo frames on appliances
ISSUE
Client wants to enable jumbo frames on eth1
eth1 Link encap:Ethernet HWaddr AB:CD:EF:01:23:45
inet addr:192.168.9.240 Bcast:192.168.9.255 Mask:255.255.255.0
inet6 addr: fe80::ae1f:6bff:fe40:ed5c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1597659 errors:0 dropped:0 overruns:0 frame:0
TX packets:294545 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1838042722 (1.7 GiB) TX bytes:76402917 (72.8 MiB)
RESOLUTION
NOTE: In the example below, we will be editing values for ETH1
You will need to add the line item MTU=9000 to the appropriate ifcfg-eth file located at /etc/sysconfig/network-scripts, and ensure the ONBOOT value is yes
TASKS
- Execute this command: vi /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth0 TYPE=Ethernet ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=none GATEWAY=192.168.9.1 NETMASK=255.255.255.0 IPADDR=192.168.9.240 METRIC=0
- Add the line MTU=9000 (below TYPE=Ethernet is fine) and set the ONBOOT=yes
DEVICE=eth0 TYPE=Ethernet MTU=9000 ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=none GATEWAY=192.168.9.1 NETMASK=255.255.255.0 IPADDR=192.168.9.240 METRIC=0
- Now restart the network services by issuing this command: service network restart
- Execute this command to show the interfaces: ifconfig
- If you do not see the interface eth1, execute this command to start it: ifup eth1
- Check the status of the interfaces again: ifconfig
- Successful output should look like:
eth1 Link encap:Ethernet HWaddr AB:CD:EF:01:23:45
inet addr:192.168.9.240 Bcast:192.168.9.255 Mask:255.255.255.0
inet6 addr: fe80::ae1f:6bff:fe40:ed5c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
RX packets:1597659 errors:0 dropped:0 overruns:0 frame:0
TX packets:294545 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1838042722 (1.7 GiB) TX bytes:76402917 (72.8 MiB)