Brian May <[email protected]> wrote:
> At Julien Goodwin's talk in April, he said, if I understand correctly,
> Internode has a bug in their implementation of PPPoA and IPv6 in that 1500
> size packets will get silently dropped. Only for IPv4, not IPv6.

It's happening for IPv4 here as well as IPv6.

I have to set my MTU to 1496 bytes on ppp0.

The symptom was that calls made to Internode's Nodephone service from my
FreeSWITCH installation failed - that is, SIP packets were dropped on the way
out.

Setting MTU to 1496 was enough to solve it. I just tested again:
ip link set mtu 1500 dev ppp0
called a Nodephone test number - no connection.

ip link set mtu 1496 dev ppp0
Repeated the call - it worked.

When originally diagnosing the problem, I ran pings of different sizes and
verified the cause.

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