port restricted cone behaviour

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Hi folks,

I noticed that on some occasions, iptables does not behave strictly as a
port restricted cone NAT.

That is, when I reuse an internal udp socket towards a new external
host/port, iptables will SOMETIMES use a new mapping port... is it a
known behaviour? a bug? a feature?

distrib debian woody
kernel: v2.4.18-bf2.4
iptables: v1.2.6a 

-- 
Claude




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