Bug 24937

Summary:	flaky connection through vlan interface
Product:	Base System	Reporter:	tburgess <tburgess>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	Unspecified
Hardware:	Any
OS:	Any

Description tburgess 2001-02-07 20:50:01 UTC

We have three vlans connected to a parent interface rl0, and have had flaky connections through the server since it was set up this way.  After much experimentation, it turns out that disabling the vlan interface and shifting one of the connections to it's own real NIC fixes the problem.  The NIC rl0 is not faulty, as it is still acting as the external connection to the internet (the machine is a firewall/gateway/NAT box).

Fix: 

Buy another NIC until you run out of PCI slots like we have :(
How-To-Repeat: See above.

Comment 1 Yar Tikhiy freebsd_committer

2001-03-28 12:33:39 UTC

Was it TCP that was flaky?

Have you considered the low MTU of the VLAN interfaces
as a possible source of the troubles?
Maybe path MTU discovery wasn't working for some reason.

--
Yar

Comment 2 Yar Tikhiy freebsd_committer

2001-05-31 11:46:11 UTC

State Changed
From-To: open->closed

It must be a path MTU discovery problem due to bogus ICMP filtering 
or whatever else. 
If the originator had supplied us with relevant details in the past 
two months, we would have given him a more accurate advice...