nfconntrack and asymmetric routing

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Hi folks,

Unfortunately I have a linux firewall
which see half of packets because of a
bad designed network.
nfconntrack table is full of these entries:

ipv4     2 tcp      6 431303 ESTABLISHED src=172.23.1.21 dst=82.9.69.137
sport=25 dport=4036 packets=2 bytes=256 [UNREPLIED] src=82.9.69.137
dst=172.23.1.21 sport=4036 dport=25 packets=0 bytes=0 mark=0 use=1

because netfilter never see the fin/rst
tcp packets.
They never expires and sometimes linux
logs these messages:

nf_conntrack: table full, dropping packet

Is there a way to tell netfilter to delete
these entries?


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