Difference between revisions of "Talk:Simple stateful firewall"

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m (References to OPEN chain(s): rm closed discussion)
(Clarification on syn scan rules: Remove closed discussion.)
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== <s>Clarification on syn scan rules </s>==
Maybe I misunderstood some of the instructions but I found that I needed to insert the rules into the chains TCP and UDP rather than OPEN-TCP and OPEN-UDP as the latter didn't exist:
# iptables -I TCP -p tcp -m recent --update --seconds 60 --name TCP-PORTSCAN -j REJECT --reject-with tcp-rst
# iptables -I UDP -p udp -m recent --update --seconds 60 --name UDP-PORTSCAN -j REJECT --reject-with port-unreach
I also found that I needed to add an --update:
# iptables -A INPUT -p icmp --icmp-type echo-request -m recent --name ping_limiter --hitcount 6 --seconds 4 -j DROP
I believe an --rcheck would also have worked. I'm not sure which would be correct. In general, I found this very helpful in conjunction with the man page for iptables. --[[User:Margali|Margali]] 21:57, 29 December 2011 (EST)
: I just checked, the above suggestions are in the rules now. closing --[[User:Indigo|Indigo]] ([[User talk:Indigo|talk]]) 21:45, 11 September 2013 (UTC)
== IPv6 icmp replies ==
== IPv6 icmp replies ==
For ipv6 adaptation.
For ipv6 adaptation.

Revision as of 11:46, 6 October 2013

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

--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)