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Video over GRE taking asymetric Path

Hi

AtoB
to
to
                   C

We have this type of connectivity A-B

A-c and B-c

Problem is when we are doing video call in between A-B fwd path is taking A-B path but reverse path is taking B-C then C-A path

we are having Point to Point GRE in between this 3 locations, as data application is taking symmetric path only, only for voice application we are facing this issue

Upon troubleshooting we found that MSS & MTU value in between Gre tunnel ( from B location to A location is having

ip mtu 1450

ip tcp adjust-mss 1412


But from A-B location GRE is having

ip mtu 1476

ip tcp adjust-mss 1400

Pls confirm whether the MTU / MSS value mismatch can cause this asymmetric routing or not ( means Video require MTU of 1476 or higher something like that)

Br/Subhojit

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