I have several locations, each connected by a Sonicwall VPN through
PPPOE DSL, with Snom 360 phones.
I've found that I have to tweak the Asterisk server MTU (inside one of
the firewalls) to get everything to work "just right". Set the server
MTU too low, and the Snom phones don't communicate correctly anymore.
Too high and the phones work, but the server can't access the web (for
yum updates, for example).
So I've settled on an MTU of 1448.
Has anyone else struggled with this? What did you settle on?
I've not experienced the problem with asterisk (but that's because I've
not implemented anything as yet behind a Sonicwall).
Sonicwall does have a problem with the mtu when using pppoe, and that
problem has been around for several software releases. Not sure why they
can't get it right, but they can't.
The limited testing that we've done suggests the mtu that you've picked
is reasonable. However, you'll still run into a problem anytime the user
on the LAN side of the firewall hits a box on the outside that happens
to be sending pkts based on a standard ethernet mtu. The only way to
correct "that" is to change the mtu at the distant location. (Obviously,
if that device is not under your control, it can't be fixed. It seems to
only be an issue with large udp packets. Not seen the problem with tcp
pkts.)
We've sent detailed packet traces to the Sonicwall engineers
specifically showing the problem, but that was about two years ago and
the problem is still around.
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