Am 23.06.2020 08:43, schrieb Luca Bertoncello:
And another thing, I discovered right now...
Could you suggest me something to restrict the problem?
Currently, I think the problem can be:
1) on Asterisk
2) on my Gateway/Firewall
A couple of years ago I added this entry in my firewall:
/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu
since I had the problem downloading data from an Internet site using my
tablet.
I found this site explaining that:
https://lartc.org/howto/lartc.cookbook.mtu-mss.html
I really forgot this entry, but now I checked all entries in my
Firewall, and I see it, with my remark...
Now, the last line of the HowTo:
--------------------------------
# iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss
128
This sets the MSS of passing SYN packets to 128. Use this if you have
VoIP with tiny packets, and huge http packets which are causing chopping
in your voice calls.
--------------------------------
Could it be the problem? Right now I'm not at home, so I cannot test it,
but maybe I can add an entry like:
iptables -A FORWARD -p tcp -m multiport --ports 5060,<my high port for
SIP> --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 128
and change the previous entry like:
iptables -A FORWARD -p tcp -i intlan0 --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu
to limit the behaviour on the internal LAN...
Your opinion?
Thanks a lot!
Luca Bertoncello
(lucab...@lucabert.de)
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