Date: Mon, 12 Mar 2007 14:19:16 -0300 From: Alexandre Biancalana <ale@seudns.net> To: Tom Judge <tom@tomjudge.com> Cc: freebsd-net@freebsd.org Subject: Re: PF route-to behavior Message-ID: <45F58B94.9000308@seudns.net> In-Reply-To: <45F5889C.3010806@tomjudge.com> References: <45F564B5.10307@seudns.net> <45F58321.5050309@tomjudge.com> <45F58758.6090103@seudns.net> <45F5889C.3010806@tomjudge.com>
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Tom Judge wrote:
> Alexandre Biancalana wrote:
>> Tom Judge wrote:
>>> Alexandre Biancalana wrote:
>>>> Hi List,
>>>>
>>>>
>>>> I´m doing a firewall setup using 6-STABLE + PF with two internet
>>>> links but I can't do the route-to rule function as I need.
>>>>
>>>>
>>>> (default gw) ______
>>>> Link A <-----------> |int A |
>>>> | |
>>>> Link B <-----------> |int B |
>>>> |______|
>>>> FreeBSD FW
>>>>
>>>> A simple thing that I need to do is test the two Internet links to
>>>> know if they are up or not. To do this I could ping or connect tcp
>>>> ports on some external ips thought each link, using nc and hping I
>>>> tried do this generate connections/packets from each network
>>>> interface connected to each link but the packets always go out by
>>>> the interface indicated by machines default route.
>>>>
>>>> I tried to add this rules in pf to force packets out by the right
>>>> interface based in your source address, but this does not work, and
>>>> the packets generated with ip of int B are going out by int A.
>>>>
>>>> pass out log on $int_a route-to ( $int_b $int_b_gw ) from $int_b to
>>>> any
>>>> pass out log on $int_b route-to ( $int_a $int_a_gw ) from $int_a to
>>>> any
>>>>
>>>>
>>>> Am I forgetting something ? Any comments ?
>>>>
>>>
>>> Have you tried setting the source IP address to int B when using
>>> ping your tcp sessions, this should force PF to do your source
>>> routing for you.
>>>
>>> Hope this helps
>>>
>>> Tom
>>
>> Yes, I tried the following commands:
>>
>> ping -S <int B address>
>> nc -s <int B address>
>> hping -I <int B>
>>
>> All the commands generate the traffic with source address of int B,
>> but the traffic always go out by int A... this is the problem, even
>> with the rules:
>>
>> pass out log on $int_a route-to ( $int_b $int_b_gw ) from $int_b to any
>> pass out log on $int_b route-to ( $int_a $int_a_gw ) from $int_a to any
>>
>> that should "correct" the interface used send this traffic out...
>> right ?!
>>
>> I can provide more details if need, but I think that is a simple
>> setup... I can't see why this does not work.... any other ideas ??
>>
>
>
> Did you try:
>
> ping -S <ip B addr> -I <if A>
# ping -S <ip B addr> -I <if A>
ping: invalid multicast interface: `<if A>'
but it should be ping -S <ip B addr> -I <if B> , for the traffic go out
by int B with int B source address right ? I tried too and the same
error happens.
From ping man page:
[...]
-I iface
Source multicast packets with the given interface address.
This
flag only applies if the ping destination is a multicast
address.
[...]
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