Talk:Simple stateful firewall

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IPv6 icmp replies

For ipv6 adaptation. As --reject-with icmp6-proto-unreachable does not exist in ipv6, as told in the page, and according to the error messages description in the RFC [[1]]. I think the icmp6-adm-prohibited which means "Communication with destination administratively prohibited" may be the message to send. It is only by reading the RFC, I am not a network expert and I have no idea of what is generally done in this case.--Cladmi 07:28, 15 February 2012 (EST)

Other articles have suggested a vanilla reject, thus:
 -A INPUT -p tcp -j REJECT --reject-with tcp-reset
 -A INPUT -p udp -j REJECT --reject-with icmp6-port-unreachable
 -A INPUT -j REJECT

--Steve-o (talk) 13:44, 13 September 2013 (UTC)

I'd say it depends what you want to do and the link to the RFC above by Cladmi is perfectly correct. I would change your last rule to
  -A INPUT -j REJECT --reject-with  icmp6-adm-prohibited
I would argue there is no big harm done complying with it anyway (more the contrary: the connecting system learns there is an IPv6 capable fw). Do you see reasons not to do it like that? --Indigo (talk) 12:15, 15 September 2013 (UTC)