MTU Size adjustment

[warmongr]

I have a 3com 3c996 SX card and a requirement to adjust the MTU size down below 1500. I can do this manually with ifconfig but was wondering if there was a modules.conf file entry with an alias that could be added to sustain a reboot. Any ideas would be appreciated.

Natr (Warmongr) Brazell

 

[thedaver]

Just put the relevant ifconfig statement in your network init file or in rc.local...



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[warmongr]

Thanks,

We modified the rc.local file however that is not very elegant and is usually considered last ditch effort. Can you provide an example of what would go in the network init file to adjust the MTU?

War.

 

[xmb]

Probably the same commands, if no ways are provided by your distro.
Debian's /etc/network/interfaces would support such, but it all ends in the same, an ifconfig exec with mtu args

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[thedaver]

Your distro will determine how you modify the interface's configuration file. Debian, as xmb said, has the mtu setting available in /etc/network/interfaces

redhat tends to have the eth0.cfg file in
/etc/sysconfig/network-scripts
where you might be able to specify the MTU as a parameter

I don't personally find the setting via rc.local to be inelegant but that might be a stylistic difference of opinion.

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[warmongr]

Thanks for all the input. I figured as much but thought I would ask anyway. Using rc.local to force parameters on the environment seems a little brute force to me given that there is a config file for nearly everything anymore. Not like the old days where the rc.local was one for the first places you went.

Again,
My appreciation. I'll play around with it and see what I find out.

N

 

[ericbrunson]

warmongr, you still don't mention the distro, but on redhat/fedora, if you read the /etc/sysconfig/network-scripts/ifup script you'll see that setting MTU in /etc/sysconfig/network-scripts/ifcfg-eth0 will set the MTU for that interface.

 

[marsd]

man sysctl.
There is no standard mechanism to manipulate low level
sets like this for 'linux' as a whole..rc.local/boot.local is as good a choice as any.

 

[warmongr]

eric,

Thanks for the help. I tried this out on Friday and it worked fine. I appreciate it. To all. Tek-Tips is still the place. I owe some posts here so don't let me off the hook.

N