Marc Haber <mh+net...@zugschlus.de> wrote: > when I update my Firewall from Kernel 5.0 to Kernel 5.1, SIP clients > that connect from the internal network to an external, commercial SIP > service do not work any more. When I trace beyond the NAT, I see that > the outgoing SIP packets have incorrect UDP checksums:
I'm a moron. Can you please try this patch? diff --git a/net/netfilter/nf_nat_helper.c b/net/netfilter/nf_nat_helper.c --- a/net/netfilter/nf_nat_helper.c +++ b/net/netfilter/nf_nat_helper.c @@ -170,7 +170,7 @@ nf_nat_mangle_udp_packet(struct sk_buff *skb, if (!udph->check && skb->ip_summed != CHECKSUM_PARTIAL) return true; - nf_nat_csum_recalc(skb, nf_ct_l3num(ct), IPPROTO_TCP, + nf_nat_csum_recalc(skb, nf_ct_l3num(ct), IPPROTO_UDP, udph, &udph->check, datalen, oldlen); return true;