one question about ICMP message handling

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When I read the code about the ICMP message handling, I found a
question:

When the host receive the ICMP message : 
Type = 3 (Destination Unreachable)
Code = 4 (Fragmentation needed and DF set)

If (ipv4_config.no_pmtu_disc) is set(to 1), then kernel will do nothing.
I'd like to know what will happen if the kernel do nothing after
receiving 
this ICMP message? The connection between source and destination will
not 
be setup forever??

Thanks in advance

Forrest

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