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Re: IP Forward Problems



On Fri, Mar 13, 2009 at 12:44:40PM +1100, Alex Samad wrote:
> On Thu, Mar 12, 2009 at 10:43:52AM -0000, Gerard Hooton wrote:
> > 
> > > On Wed, Mar 11, 2009 at 01:07:06PM +0000, Gerard Hooton wrote:
> > >> Hello,
> 
> [snip]
> 
> > >
> > > 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
> > 
> > OK ....
> > 
> > ip route
> > 143.239.0.0/16 dev eth0  proto kernel  scope link  src 143.239.184.13
> > 143.239.0.0/16 dev eth1  proto kernel  scope link  src 143.239.184.75
> > default via 143.239.1.199 dev eth0  src 143.239.184.12
> 
> So still the other questions, why do you need to route ie why do you
> need forward?

Another thing to check is proxy_arp 

sysctl -a | grep arp | sort | less

net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.default.arp_accept = 0
net.ipv4.conf.default.arp_announce = 0
net.ipv4.conf.default.arp_filter = 0
net.ipv4.conf.default.arp_ignore = 0
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.eth0.arp_accept = 0
net.ipv4.conf.eth0.arp_announce = 0
net.ipv4.conf.eth0.arp_filter = 0
net.ipv4.conf.eth0.arp_ignore = 0
net.ipv4.conf.eth0.proxy_arp = 0
net.ipv4.conf.lo.arp_accept = 0
net.ipv4.conf.lo.arp_announce = 0
net.ipv4.conf.lo.arp_filter = 0
net.ipv4.conf.lo.arp_ignore = 0
net.ipv4.conf.lo.proxy_arp = 0
net.ipv4.conf.wlan0.arp_accept = 0
net.ipv4.conf.wlan0.arp_announce = 0
net.ipv4.conf.wlan0.arp_filter = 0
net.ipv4.conf.wlan0.arp_ignore = 0
net.ipv4.conf.wlan0.proxy_arp = 0


> 
> 
> [snip]
> 
> -- 
> "If you're sick and tired of the politics of cynicism and polls and principles, come and join this campaign."
> 
> 	- George W. Bush
> 02/16/2000
> Hilton Head, S.C.



-- 
"We need to apply 21st-century information technology to the health care field. We need to have our medical records put on the I.T."

	- George W. Bush
01/05/2005
Collinsville, IL

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