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* ARP routing issue
@ 2005-01-06 15:47 Jan De Luyck
  2005-01-06 17:51 ` Alan Cox
  2005-01-07  7:44 ` ARP routing issue Julian Anastasov
  0 siblings, 2 replies; 16+ messages in thread
From: Jan De Luyck @ 2005-01-06 15:47 UTC (permalink / raw)
  To: linux-kernel; +Cc: linux-net

Hello lists,

Sorry to bother you with this probably beat-to-death issue, but I can't figure 
out the solution to the problem.

It's perfectly described in this archive thread:

http://www.uwsg.iu.edu/hypermail/linux/net/0308.1/0071.html

Basically it comes down to this:

I have an IBM server running RH ES, kernel 2.4.9-e.49. It has two interfaces:
eth0 10.0.22.xxx 
eth1 10.0.24.xxx

default gateway is set to 10.0.22.1, on eth0.

Problem is, if I try to ping from another network (10.216.0.xx) to 10.0.24.xx, 
i see the following ARP request:

arp who-has 10.0.22.1 tell 10.0.24.xx

which, imo, is wrong.

I know it has to do with the default gatway, but I can't devise a way to make 
it actually _WORK_.

Any pointers?

Thanks.

Jan
-- 
No one can feel as helpless as the owner of a sick goldfish.

^ permalink raw reply	[flat|nested] 16+ messages in thread
* RE: ARP routing issue
@ 2005-01-06 16:06 Steve Iribarne
  2005-01-06 16:11 ` Jan De Luyck
  0 siblings, 1 reply; 16+ messages in thread
From: Steve Iribarne @ 2005-01-06 16:06 UTC (permalink / raw)
  To: Jan De Luyck, linux-kernel; +Cc: linux-net

Hi Jan,

 
-> default gateway is set to 10.0.22.1, on eth0.
-> 
-> Problem is, if I try to ping from another network 
-> (10.216.0.xx) to 10.0.24.xx, i see the following ARP request:
-> 
-> arp who-has 10.0.22.1 tell 10.0.24.xx
->

You see that coming out the eth0 interface??  

If that is the case it is most definately wrong.  Assuming that your
masks are setup properly.  But I haven't worked on the 2.4 kernel for a
long time so I'm not so sure if what you are seeing is a bug that has
been fixed.

-stv

^ permalink raw reply	[flat|nested] 16+ messages in thread
* RE: ARP routing issue
@ 2005-01-06 17:51 Steve Iribarne
  2005-01-06 17:57 ` Jan De Luyck
  0 siblings, 1 reply; 16+ messages in thread
From: Steve Iribarne @ 2005-01-06 17:51 UTC (permalink / raw)
  To: Jan De Luyck; +Cc: linux-kernel, linux-net

And you see the arp packet coming out which interface??

 

-> -----Original Message-----
-> From: Jan De Luyck [mailto:lkml@kcore.org] 
-> Sent: Thursday, January 06, 2005 8:12 AM
-> To: Steve Iribarne
-> Cc: linux-kernel@vger.kernel.org; linux-net@vger.kernel.org
-> Subject: Re: ARP routing issue
-> 
-> On Thursday 06 January 2005 17:06, Steve Iribarne wrote:
-> > Hi Jan,
-> >
-> >
-> > -> default gateway is set to 10.0.22.1, on eth0.
-> > ->
-> > -> Problem is, if I try to ping from another network
-> > -> (10.216.0.xx) to 10.0.24.xx, i see the following ARP request:
-> > ->
-> > -> arp who-has 10.0.22.1 tell 10.0.24.xx
-> > ->
-> >
-> > You see that coming out the eth0 interface??
-> >
-> > If that is the case it is most definately wrong.  Assuming 
-> that your 
-> > masks are setup properly.  But I haven't worked on the 2.4 
-> kernel for 
-> > a long time so I'm not so sure if what you are seeing is a 
-> bug that 
-> > has been fixed.
-> 
-> The network information is:
-> eth0 10.0.22.xxx mask 255.255.255.0
-> eth1 10.0.24.xxx mask 255.255.255.0
-> 
-> routing:
-> 10.0.22.0 0.0.0.0 255.255.255.0 eth0
-> 10.0.24.0 0.0.0.0 255.255.255.0 eth1
-> 0.0.0.0  10.0.22.1 0.0.0.0  eth0
-> 
-> Jan
-> 
-> --
-> If a man slept by day, he had little time to work.  That was 
-> a satisfying notion to Escargot.
->   -- "The Stone Giant", James P. Blaylock
-> 

^ permalink raw reply	[flat|nested] 16+ messages in thread
* Re: ARP routing issue
@ 2005-01-07  1:29 Zhenyu Wu
  0 siblings, 0 replies; 16+ messages in thread
From: Zhenyu Wu @ 2005-01-07  1:29 UTC (permalink / raw)
  To: rol; +Cc: linux-kernel

I met a question about ARP. If i send packet to another host using Raw socket at
one host and i set protocol type into TCP, then at another host i receive the
packet, but when i read the field skb->protocol, it is ARP. But when i changed a
host to send the packet, it does well. 

There are something wrong on my network card or the Kernel?


>Hello,
> 
> Have a look at /proc/sys/net/conf/XXX/arp_filter :
> 
>         
> arp_filter - BOOLEAN
>         1 - Allows you to have multiple network interfaces on the same
>         subnet, and have the ARPs for each interface be answered
>         based on whether or not the kernel would route a packet from
>         the ARP'd IP out that interface (therefore you must use source
>         based routing for this to work). In other words it allows control
>         of which cards (usually 1) will respond to an arp request.
> 
>         0 - (default) The kernel can respond to arp requests with addresses
>         from other interfaces. This may seem wrong but it usually makes
>         sense, because it increases the chance of successful communication.
>         IP addresses are owned by the complete host on Linux, not by
>         particular interfaces. Only for more complex setups like load-
>         balancing, does this behaviour cause problems.
> 
> Regards,
> Paul
> 
> Paul Rolland, rol(at)as2917.net
> ex-AS2917 Network administrator and Peering Coordinator
> 
> --
> 
> Please no HTML, I'm not a browser - Pas d'HTML, je ne suis pas un navigateur
> 
> "Some people dream of success... while others wake up and work hard at it" 
> 
>   
> 
> > -----Message d'origine-----
> > De : linux-kernel-owner@vger.kernel.org 
> > [mailto:linux-kernel-owner@vger.kernel.org] De la part de Jan De Luyck
> > Envoy?: jeudi 6 janvier 2005 17:12
> > ?: Steve Iribarne
> > Cc : linux-kernel@vger.kernel.org; linux-net@vger.kernel.org
> > Objet : Re: ARP routing issue
> > 
> > On Thursday 06 January 2005 17:06, Steve Iribarne wrote:
> > > Hi Jan,
> > >
> > >
> > > -> default gateway is set to 10.0.22.1, on eth0.
> > > ->
> > > -> Problem is, if I try to ping from another network
> > > -> (10.216.0.xx) to 10.0.24.xx, i see the following ARP request:
> > > ->
> > > -> arp who-has 10.0.22.1 tell 10.0.24.xx
> > > ->
> > >
> > > You see that coming out the eth0 interface??
> > >
> > > If that is the case it is most definately wrong.  Assuming that your
> > > masks are setup properly.  But I haven't worked on the 2.4 
> > kernel for a
> > > long time so I'm not so sure if what you are seeing is a 
> > bug that has
> > > been fixed.
> > 
> > The network information is:
> > eth0 10.0.22.xxx mask 255.255.255.0
> > eth1 10.0.24.xxx mask 255.255.255.0
> > 
> > routing:
> > 10.0.22.0 0.0.0.0 255.255.255.0 eth0
> > 10.0.24.0 0.0.0.0 255.255.255.0 eth1
> > 0.0.0.0  10.0.22.1 0.0.0.0  eth0
> > 
> > Jan
> > 
> > -- 
> > If a man slept by day, he had little time to work.  That was a
> > satisfying notion to Escargot.
> >   -- "The Stone Giant", James P. Blaylock
> > -
> > To unsubscribe from this list: send the line "unsubscribe 
> > linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
> > 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>



^ permalink raw reply	[flat|nested] 16+ messages in thread
end of thread, other threads:[~2005-01-15 23:56 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-01-06 15:47 ARP routing issue Jan De Luyck
2005-01-06 17:51 ` Alan Cox
2005-01-07  6:49   ` Jan De Luyck
2005-01-13 13:13   ` vfs and paging error Sumit Pandya
2005-01-07  7:44 ` ARP routing issue Julian Anastasov
2005-01-07  8:06   ` Jan De Luyck
2005-01-06 16:06 Steve Iribarne
2005-01-06 16:11 ` Jan De Luyck
2005-01-06 17:53   ` Paul Rolland
2005-01-06 17:57     ` Jan De Luyck
2005-01-14 22:47   ` James Courtier-Dutton
2005-01-15 12:31     ` Jan De Luyck
2005-01-15 22:51       ` Alan Cox
2005-01-06 17:51 Steve Iribarne
2005-01-06 17:57 ` Jan De Luyck
2005-01-07  1:29 Zhenyu Wu

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