[c-nsp] L2TPv3 and VLANs

[Andrew Yourtchenko]

On Thu, 18 Jun 2009, Paul Stewart wrote:

> I must admit  - I didn't know such an option existed... and that's great to
> know...

I myself discovered it by accident when I saw the MTU on my linux box to 
be not the 1500 :-)

>
> On a related note to the PS below... we have tested lt2tpv3 on a few
> different boxes running various IOS images and on each of the devices we did
> test we seen the same behavior.  This means something is either broke in the
> code in my opinion or that we are doing something wrong.  Typically that
> means the second option in our case (lol) but I did get a fair amount of
> feedback offline from folks with similar problems....;)

It could be as well that it is the first option but that the tcp 
mss-adjust hack is working "good enough" for anyone to bother - there are 
always "more important battles" to fight. But if someone on the list is 
willing to spend some cycles on this in the lab and subsequently open a 
case to get this to a more definitive status quo - unicast me.

thanks,
andrew

p.s. about the protocols that can break with this scenario, a few things 
come to mind: kerberos, possibly IKE w/certs, SNMP, netflow.