Bug 28908

Summary:	fxp driver does not support child VLAN interfaces with MTU 1500
Product:	Base System	Reporter:	pam <pam>
Component:	kern	Assignee:	jlemon
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	Unspecified
Hardware:	Any
OS:	Any

Description pam 2001-07-12 09:50:01 UTC

fxp driver does not support 1500 MTU on its child VLAN interfaces

Fix: 

current fxp codebase claims to integrate Peter Lobo patch for VLAn support. Original code + patch worked properly handling longer Ethernet frames and MTU 1500 on vlan interfaces.
How-To-Repeat: ifconfig fxp0 up
ifconfig vlan0 inet 192.168.0.1 netmask 0xffffff00 vlan 1 vlandev fxp0

MTU in interface will be 1496, attempts to force 1500 MTU will result in network problems.

Comment 1 Kris Kennaway freebsd_committer

2001-07-13 00:40:32 UTC

Responsible Changed
From-To: freebsd-bugs->jlemon

jlemon wrote the new fxp driver

Comment 2 jlemon freebsd_committer

2001-07-25 19:03:51 UTC

State Changed
From-To: open->closed

Submitter was using the fxp driver as a module, and vlan support 
was not being built into the module.  Fixed in -stable as of today.