RE: A PC with two NIC routing problem

Look at Linux based source routing.

Start here. http://www.linuxjournal.com/article/7291

-ryan

> -----Original Message-----
> From: Jack [mailto:ccie.unnumbered_at_gmail.com]
> Sent: Friday, October 01, 2010 3:45 PM
> To: Ryan West
> Cc: <ccielab_at_groupstudy.com>
> Subject: Re: A PC with two NIC routing problem
>
> It is a linux server with multiple guest virtual guest in it.
> Without changing the existing services in a Vlan, it is desired to add another
> NIC to provide additional services with clients on another vlan.
> can linux ip table address the problem?
>
>
> Thanks,
> Jack
>
> On 10/01/2010 03:34 PM, Ryan West wrote:
> > Stop dual homing the box or proxy the connections from a box on the
> network without the default gateway. What's the real problem you're trying
> to solve, is there an application that needs to be reached on that interface?
> >
> > Sent from handheld
> >
> > On Oct 1, 2010, at 2:10 PM, Jack<ccie.unnumbered_at_gmail.com> wrote:
> >
> >
> >> Here is my guess:
> >> when host10 pings 11.11.11.100, the ip packet source address is
> 10.10.10.10 and it reaches 11.11.11.100;
> >> when the linux PC sends the reply, it uses 10.10.10.100 as the source
> address and Host10 does not like it because it is not from 11.11.11.100.
> >> Does it make sense?
> >> If so, how to fix it?
> >>
> >> Thanks,
> >> Jack
> >>
> >> On 10/01/2010 01:41 PM, Sergey Matashuk wrote:
> >>
> >>> do host10 and host11 have defult gateway configured?
> >>>
> >>> On Fri, Oct 1, 2010 at 8:32 PM, Jack<ccie.unnumbered_at_gmail.com>
> wrote:
> >>>
> >>>
> >>>> A linux PC has two NIC cards:
> >>>> eth0=10.10.10.100/24 belongs to VLAN 10
> >>>> eth1=11.11.11.100/24 belongs to VLAN 11
> >>>> the default gateway is 10.10.10.1
> >>>>
> >>>> A layer 3 switch has the following configuration:
> >>>> int vlan 10
> >>>> ip addr 10.10.10.1 255.255.255.0
> >>>> int vlan 11
> >>>> ip addr 11.11.11.1 255.255.255.0
> >>>>
> >>>>
> >>>> Host10 on vlan 10 with ip address 10.10.10.10/24 can ping 10.10.10.100,
> but
> >>>> cannot ping 11.11.11.100
> >>>>
> >>>> Host11 on vlan 11 with ip address 11.11.11.11/24 can ping 11.11.11.100,
> but
> >>>> cannot ping 10.10.10.100
> >>>>
> >>>>
> >>>> How to make the linux PC respond to all pings from both hosts?
> >>>>
> >>>>
> >>>> Thanks,
> >>>> Jack
> >>>>
> >>>>
> >>>> Blogs and organic groups at http://www.ccie.net
> >>>>
> >>>>
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> >>
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> >>
> >>
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Received on Fri Oct 01 2010 - 20:04:30 ART