[c-nsp] MLPP problems

[Pavel Dimow]

Hi,

I have a strange trouble with MLPP with four SHDSL links. The problem
is that a few seconds or shall I say a minute everything works fine,
then we suddenly experience huge latency ie from 14ms to 1000ms and
then everything back to normal and then again after a few sec to
minute everything is fine and starts over and over again. As this is a
disaster for VoIP traffic I have tried many things with mlppp like
turning on/off interleaving, on/off fragmentation, leaving only one
link in a bundle (in case that we have a huge latency difference on
any link) on/off cef, changed mtu to as low as 1200 (but I am sending
64 bytes packets with ping) and everything is the same. ISP tells us
lines are ok, and we don't see any errors on dsl links. We are running
pppoa. Anyone have similar experiences? Any suggestions what I can try
next? I use adaptive ping to measure latency described above. And this
happens even when I shutdown LAN interface ie, no traffic except ping
flowing.

Any help is highly appreciated.