Configurable TCP max seg size

[mwindower]

There may exist network paths that can't handle jumbo frames correctly.
The default metal-stack MTU is 9000.

Currently it is investigated if nftables rules like this fix the problem for TCP by setting the max seg size with TCP SYN:

ip saddr 100.127.0.0/17 oifname vlan<PRIVATE_NET_ID> flags syn tcp option maxseg size set 1460 counter comment "mangle maxseg size in"
ip daddr 100.127.0.0/17 oifname vlan104010 flags syn tcp option maxseg size set 1460 counter comment "mangle maxseg size out"

[mwindower]

needs validation from a real cluster

[majst01]

Is this still a valid issue