06-05-2018 02:29 AM
Hi All,
I have an issue about sip/rtp traffic. Endpoints are using a calling application that used sip protocol . We have also enabled fragment feature in zone protection setting.I investigate this issue and when endpoint make calling, zone protection drops rtp packets because they are fragmented.
Could you inform me is there another solution advice without disabling fragment feature?
Thanks for ur interested
06-05-2018 06:45 AM
hi @skucukgul
you could investigate why there is fragemting: you may need to change the MTU and/or enable and tweak TCP MSS on the interfaces to decrease the paymload and prevent fragmentation
06-05-2018 03:22 PM
hi @reaper,
firstly thanks for your advice.
does changing tcp mss payload amount affect to other running thing? And also which amount I should adjust? default amount is 40 as I know.
06-06-2018 12:00 AM
adjustiing the TCP MSS will impact all traffic (that uses mss in it's header)
there are several tools you could give a try to measure the path MTU to determine the lowest MTU along the path, and then use the mss adjust to lower the mss to match the mtu with the most optimal setting (or give the default a trry)
06-06-2018 06:27 AM
Further to reapers suggestions. You could create subinterface on the firewall with a different zone and zone protection profile attached?
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