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iptables should handle ICMP errors #5916

@ghananigans

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@ghananigans

Incoming ICMP errors are not properly rewritten when the ICMP error is for a tracked TCP/UDP connection.

This will result in TCP/UDP connections that are NAT-ed to never receive ICMP errors.

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    area: networkingIssue related to networkingtype: bugSomething isn't working

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