[Click] Problem sending VLAN tagged packets

[Eddie Kohler]

My guess this is a bug in Linux or the underlying operating system.  You're 
using userlevel ToDevice; the element has no idea of any "maximum length", it 
just reports errors returned by the send() system call.  So someone somehwere 
forgot that VLAN-enabled packet socket interfaces have a different MTU than 
plain ol ethernet.

E


Nicholas Weaver wrote:
> Stupid error (probably) on my part somewhere...
> 
> OK, I'm trying to add a VLAN tag on all packets.  Of course, for MTU
> packets, this adds 4 bytes.
> 
> So I'm getting a bunch of 
> ToDevice(eth5) send: Message too long
> errors from these now "overlength" packets.
> 
> However, these are NOT overlength, as MTU for ethernet is +4 bytes for
> VLAN tagged packets.  Suggestions?
>