From: Andreas Fink > Sent: 28 August 2023 13:03 > > I have a specific issue related to SCTP and MTU size and I'm not sure how it should be solved > correctly. > > I have this setup > > Host A <---> router <---ipsec-tunnel---> router B <----> Host B > > Host A is my Linux machine and has a default MTU of 1500 > the IPsec tunnel reduces the MTU to a lower value (1476 or something like that) > Router-B and Host B are devices we do not control A thought I had is can you do something that might enable IP-fragmentation in the ipsec-tunnel so that the longer packets can be transferred? I rather hope our M3UA customers use ipsec tunnels (or similar) and no one has ever asked us to limit the mtu. ... > The other side is a ZTE mobile switch and the partner has no way of controlling the MTU (or they have > no clue). > So we can only control the Host A and Router A side. I'd bet 'no clue' :-) You'd expect they'd get the same problem with connections to everywhere else as well. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
