ICMP breaks TCP connection

[Mikulas Patocka <mikulas@xxxxxxxxxxxxxxxxxxxxxxxx>]

Hi

I found that Linux 2.2.16 and 2.4.25 break tcp connection (with no route
to host error) after first attempt when received ICMP packet with type 3
and code 1 (ICMP_UNREACH_HOST).

RFC1122, section 3.2.2.1 says, that the message MUST be interpreted as
hint, not proof of unreachable machine.

Mikulas