thanks Mr.Raja,
Is there any possibility to modify the kernel to use src
ip as eth0:1 instead of eth0.
*Thanks & Regards*
*Govi*
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* **Save the Planet...*
On Sat, Oct 16, 2010 at 4:35 AM, Raja Subramanian <[email protected]>wrote:
> On Thu, Oct 14, 2010 at 10:26 AM, Govi <[email protected]> wrote:
> > I have one ethernet card(eth0) , with three ip address(2 aliases).
> > When ever i am establishing a connection it was sending through eth0 only
> > .incomming packets are receiving for all the ips.
> >
> > My questions all the outgoing packets are sent through eth0 only or i
> will
> > sent through any one ip( eth0 , eth0:1 or eth0:2 ).
>
> When you initiate a connection from your system, the kernel is free
> to choose any suitable source IP based on the kernel routing table.
> And by default, the primary IP of the interface is selected as src IP.
>
> If you want your application to use a specific IP (eth0:1), then your
> daemon/app needs to bind to that specific IP *before* initiating a
> connection. Most applications use 0.0.0.0 as the src IP by default
> and let the kernel choose the appropriate src IP.
>
> Eg. If eth0 is 192.168.0.10, eth0:1 is 192.168.0.11
>
> "ping 192.168.0.1" will send ICMP packets with src IP 192.168.0.10
>
> "ping -I 192.168.0.11 192.168.0.1" will send ICMP packets with src
> IP 192.168.0.11
>
>
> Note that having multiple IPs defined in the same subnet can cause
> other unexpected problems unless it is handled specifically. If you
> have two physical interfaces with IPs assigned in the same subnet,
> ARP requests/responses can get mixed up and cause issues. IIRC
> recent kernel versions have addressed these issues.
>
> - Raja
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