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Re: IP Forward Problems



On Wed, Mar 11, 2009 at 01:07:06PM +0000, Gerard Hooton wrote:
> Hello,
> Fist my system:
> 
> Linux uepc004 2.6.24-1-686 #1 SMP Thu May 8 02:16:39 UTC 2008 i686
> GNU/Linux
> 
> Network:
> eth0      Link encap:Ethernet  HWaddr 00:30:48:29:e9:40  
>           inet addr:143.239.184.13  Bcast:143.239.255.255
> Mask:255.255.0.0 
>           inet6 addr: fe80::230:48ff:fe29:e940/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1751152 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:33579 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:174917895 (166.8 MiB)  TX bytes:19228996 (18.3 MiB)
>           Base address:0x3000 Memory:f8200000-f8220000 
> 
> eth0:0    Link encap:Ethernet  HWaddr 00:30:48:29:e9:40  
>           inet addr:143.239.184.12  Bcast:143.239.255.255
> Mask:255.255.0.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           Base address:0x3000 Memory:f8200000-f8220000 
> 
> eth1      Link encap:Ethernet  HWaddr 00:30:48:29:e9:41  
>           inet addr:143.239.184.75  Bcast:143.239.255.255
> Mask:255.255.0.0
>           inet6 addr: fe80::230:48ff:fe29:e941/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1738672 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:228 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:180938419 (172.5 MiB)  TX bytes:20519 (20.0 KiB)
>           Base address:0x3040 Memory:f8220000-f8240000 
> 
> lo        Link encap:Local Loopback  
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:14810 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:14810 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:20030201 (19.1 MiB)  TX bytes:20030201 (19.1 MiB)
> 
> 
> #################### The Problem ################################
> 
> I have discovered that with net.ipv4.ip_forward = 1
> the  apr table starts to grow and grow and I think I get an arp table
> overflow. Also I get No buffer space available errors. When I do
> net.ipv4.ip_forward = 0 the arp table reduces to a normal size and the 
> No buffer space available errors stop.

why do you have 3 interface into the same ip network ? I presume there
are all attached to the same ethernet broadcast domain ?

that shouldn't be causing the problem though. have you done a tcpdump to
see what traffic is being forwarded ? The other question is why do you
need to forward ?

can you do an ip route please

> 
> Any ideas?
> 
> Thanks.
> 
> -- 
> Gerard Hooton.
> Department of Microelectronic Engineering U.C.C.
> Butler Building,
> Enterprise Centre,
> North Mall.
> Cork.
> 
> Tel: +353 21 4904576
> Fax: +353 21 4904573
> http://www.ue.ucc.ie/
> 
> 
> 
> 
> -- 
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> 

-- 
"We're concerned about AIDS inside our White House -- make no mistake about it."

	- George W. Bush
02/07/2001

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