deleting the inet address on xl1 and manually re-adding it. I'm not sure why this fixed my problems, but I can ping my servers behind the router with pings sizes greater then 1468 bytes "ping -s 1469 <IP Address">.
It seems that at startup, something messes up the vlan setup. here is what I have in my /etc/rc.conf
ifconfig_xl0="inet 10.0.0.3 netmask 255.255.255.192" ifconfig_xl1="inet 207.176.232.142 netmask 255.255.255.224" ifconfig_vlan0="inet 10.0.1.3 netmask 255.255.255.224 vlan 3 vlandev xl1" ifconfig_vlan0_alias0="inet 10.0.1.1 netmask 255.255.255.255" ifconfig_vlan1="inet 10.0.11.3 netmask 255.255.255.224 vlan 4 vlandev xl1" ifconfig_vlan1_alias0="inet 10.0.11.1 netmask 255.255.255.255" defaultrouter="207.176.232.158"
For some reason, doing an "ifconfig xl1 delete 207.176.232.142" followed by "ifconfig xl1 inet 207.176.232.142 netmask 255.255.255.224" allows me to ping the servers with the ping sizes I couldn't before... perhaps the inet interface on the device needs to be set after the vlan interfaces?
Any thoughts?
Thanks, Stephane.
From: [EMAIL PROTECTED] To: Stephane Raimbault <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] Subject: Re: VLAN MTU problem in 4.9 ? Date: Fri, 2 Jan 2004 21:29:43 +0300 (MSK)
> 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...
You can't be free from tune all your net for vlan mtu:
- all switches involved must be at least verifyed not to drop long frames
or right route vlans if it can work with tag based vlans
- all interfaces in selected vlan must support the same common mtu
I know now, that xl interface can't pass 1504 frames and most 1G interfaces can don't know about another 100M interfaces
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