Re: VLAN MTU problem in 4.9 ?

[Stephane Raimbault]

Setting the MTU to 1496 on the router vlan interfaces didn't seem to help 
me... however put the MTU to 1496 on the servers on the VLAN itself seems to 
resolve the problem.  so in the current configuration the router vlan 
interfaces are set to 1500 and the servers on those interfaces are set to 
1496.  Seems to work for now.

Now, this doesn't seem all that normal.  Where can I go from here to 
troubleshoot this more and provide more information that might be able to 
resolve this problem... if it's a problem that is...

Thanks,
Stephane.

From: [EMAIL PROTECTED]
To: Stephane Raimbault <[EMAIL PROTECTED]>
CC: [EMAIL PROTECTED]
Subject: Re: VLAN MTU problem in 4.9 ?
Date: Sat, 27 Dec 2003 07:54:39 +0300 (MSK)
> Hi,
>
> I have the following setup on a freebsd box acting as a router for 
multiple
> LAN's.
>
> xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 10.0.0.3 netmask 0xffffffc0 broadcast 10.0.0.63
>         inet6 fe80::260:97ff:fe07:5f4b%xl0 prefixlen 64 scopeid 0x1
>         ether 00:60:97:07:5f:4b
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> xl1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 207.176.232.142 netmask 0xffffffe0 broadcast 
207.176.232.159
>         inet6 fe80::2c0:4fff:fe9e:b9c7%xl1 prefixlen 64 scopeid 0x2
>         ether 00:c0:4f:9e:b9:c7
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 10.0.1.3 netmask 0xffffffe0 broadcast 10.0.1.31
>         inet6 fe80::260:97ff:fe07:5f4b%vlan0 prefixlen 64 scopeid 0x4
>         ether 00:c0:4f:9e:b9:c7
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
>         vlan: 3 parent interface: xl1
> vlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 10.0.11.3 netmask 0xffffffe0 broadcast 10.0.11.31
>         inet6 fe80::260:97ff:fe07:5f4b%vlan1 prefixlen 64 scopeid 0x5
>         ether 00:c0:4f:9e:b9:c7
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
>         vlan: 4 parent interface: xl1
>
>
> The setup is physically connected like this
>
> Switch 1 <---> (xl0) FreeBSD (xl1) <---> Switch 2
>
> My Workstation is connected to Switch 1 on the ip network 10.0.0.0/26
> The Server(s) I'm connecting to are on Switch 2 on the ip network
> 10.0.11.0/27 and/or 10.0.1.0/27
>
> I seem to have some problems connecting to the above mentioned servers 
on
> vlan0 and vlan1.  My SSH session seems to freeze when I type a command 
that
> will output quite a bit of data (top, etc...)  I also seem to have some
> other large data problems between the servers communicating to each 
other
> over the VLAN's.
>
> I had a working setup, but since I upgraded from 4.9-RC2 on the FreeBSD
> router to 4.9-RELEASE-p1 I've been having the above described problem.  
I'm
> wondering if I left something out in my KERNEL configuration when I 
upgraded
> or if I've stumbled onto a bug in 4.9-R ?

ifconfig vlan0 mtu 1496
ifconfig vlan1 mtu 1496
will restore old behavior.
But I do not know when default mtu for vlan
was changed.
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