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Re: Keep carp interfaces in sync, WAS: problems with carp and vlans
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: Re: Keep carp interfaces in sync, WAS: problems with carp and vlans
- From: "Lars Weste" <lweste_(_at_)_gmx_(_dot_)_de>
- Date: Thu, 20 Apr 2006 11:57:41 +0200 (MEST)
>> with scrub in all set at the firewall, will openbsd handle icmp
>> of type unreach code needfrag automatically, because of the
>> as far as i know, icmp packtes like port/host/network unreachable are
>> allowed by the keep state statements, does this also apply for the
>> fragment codes of icmp unreachable messages?
>> or shall I have to add a rule to allow these packets explicitly?
> citating pf.conf(5):
> STATEFUL INSPECTION
> ICMP messages fall into two categories: ICMP error messages, which
> refer to a TCP or UDP packet, are matched against the referred to
> tion. If one keeps state on a TCP connection, and an ICMP source
> message referring to this TCP connection arrives, it will be
> the right state and get passed.
Thanks, I must have overlooked it, i thought only these unreachable
messages will be part of a state.
but on the other side I found this:
regarding Linux NFS and openbsd pf and scrub. After reading that, I
assume that I will not need to add an explicit rule for the needfrag ICMP
packets, only if I will run into some trouble, I might exclude a bit
traffic from scrubbing.
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