Director not sending icmp unreachable to expired clients

[Janusz Krzysztofik <jkrzyszt@xxxxxxxxxxxx>]

Hi,

I am using LVS director with no VIP for load balancing ipsec servers 
accessed by NATed clients (udp 500/4500, fwmark method). When I remove a 
relaserver (ipvsadm -d ...), its clients are not notified after their 
connections expire. I suspect that icmp responses are simply not 
generated on the director as they sholud be - I can not see them with 
tcpdump nor trace them with iptables rules. I could not find any piece 
of code in the IPVS sources (linux 2.6.18) that would generate such 
error responses. Are these icmp messages supposed to be generated by 
other means? If so, could it be that a director with no VIP is not able 
to respond?
Cheers,
Janusz