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From Jim Maul <jm...@elih.org>
Subject Re: [users@httpd] Narrowing Down A Strange Problem
Date Wed, 15 Sep 2004 18:25:45 GMT
Quoting Alexander Stoll <technoworx@gmx.de>:

> David P. Donahue schrieb:
>
>> I am interested in your suggestion to "lower the MTU of your server."
>> This is new to me and I would love to add it to my testing.  How would I
>> lower this value?  Note, I am running Apache 1.3.31 on Slackware 10.0.
>
> OK, here we go...
> This is something your OS has to provide and is independend from Apache...
> I don´t know slackware distribution but basic tools must be present...
>
> if you become root on the system and fire up a "ifconfig" something like
>
> eth0      Link encap:Ethernet  HWaddr 00:D0:B7:06:2B:4D
>            inet addr:10.0.0.130  Bcast:10.0.0.255  Mask:255.255.255.0
>            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>
> should appear, if you prefer ip, type in "ip link show" an something like
>
> 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
>      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eth0: <BROADCAST,MULTICAST,ALLMULTI,UP> mtu 1500 qdisc pfifo_fast
> qlen 1000
>      link/ether 00:d0:b7:06:2b:4d brd ff:ff:ff:ff:ff:ff
>
> this indicates a mtu of 1500 (normal ethernet default)
>
> If you haven´t access to the console of the server, be aware of that any
> changes who interrupt network connectivity could cause no more access to
> your server! So be careful... ;-)
>
> with present values
> "ifconfig eth0 down; ifconfig eth0 10.0.0.130 netmask 255.255.255.0
> broadcast 10.0.0.255 mtu 1250 up" (in one line!!!)
> brings up the interface with desired mtu
>
> alternative with ip:
>
> "ip link set eth0 mtu 1250"
>
> This should be prefered if ip is present on your server since this
> should be non destructive to your network connectivity. Replace values
> for address, netmask, broadcast and interface name with your local needs...
>
> REMEMBER! Don´t hammer on my mailbox when a mistyped command destroys
> network access to your server until rebooted... ;-)))
>

I would just like to add that this should only have to be done on some dsl
lines.  We had a similar problem on a dsl line that we have where 
outlook would
refuse to send out an email if it was over a certain size (the mtu 
setting).  We
had to go around to all workstations and change the mtu from 1500 to 
1492.  What
a pita.

-Jim

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