Date: Sun, 22 Jul 2007 17:44:10 +0200
From: Milan Obuch <freebsd-net@dino.sk>
To: freebsd-net@freebsd.org
Subject: Re: Policy-based routing for packets originating from local machine ('reinject' packets back into kernel?)
Message-ID: <200707221744.11119.freebsd-net@dino.sk>
In-Reply-To: <51976.10.23.23.1.1185116844.squirrel@mail.weirdwire.ru>
References: <51976.10.23.23.1.1185116844.squirrel@mail.weirdwire.ru>
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On Sunday 22 July 2007, m_wlist@weirdwire.ru wrote:
> Hello.
>
...
>
> At the moment I'm trying to get that working with netgraph's ngeth
> interfaces. But they seem to behave in some really weird way.
> Details:
> # ifconfig ngeth0 10.42.42.1 netmask 255.255.255.250
Netmask 255.255.255.250 looks weird to me. Something like this is really
unusual. What does ifconfig ngeth0 show?
> # ngctl connect ngeth0: ngeth1: lower upper
> # ngctl connect ngeth1: ngeth0: lower upper
> ('tcpdump -ni ngeth0' on other terminal for great justice)
> # ping 10.42.42.2
> (here after some delay I get 'host is down' messages with no output from
> tcpdump).
> # ping 10.42.42.5
> (broadcast address, gives nothing from ping, and 'blal blah 10.42.42.1 >
> 10.42.42.5: ICMP echo request, blah' from tcpdump)
> (here i change tcpdump from ngeth0 to ngeth1)
> # ping 10.42.42.2 and # ping 10.42.42.3
> give 'host is down' from ping and nothing from tcpdump
> # ping 10.42.42.4
> (LOL WUT!) still gives 'host is down' from ping, but tcpdump -ni ngeth1
> gives 'arp who-has 10.42.42.4 tell 10.42.42.1'!
>
> That raises two questins:
> 1) Wtf is going on?
> 2) How to make ngeth just send ip packet, avoiding that arp stuff (or is
> there any other virtual interface devices available that do that)?
>
I can't comment on these question, but my recommendation would be to choose
more usual mask - if it's not a typo, this could cause various interesting
errors.
Regards,
Milan
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