Re: Using several MAC addresses on a single network interface

[Stefano Bizzarri <nexius () email it>]

Alexander Klimov wrote:

> Hi, all.
>
> I want one host to appear as several different ones down to Ethernet level. It
> is very easy, e.g., under Linux (2.4.26) to make a single host represent several
> IPs:
>
> ifconfig eth0:1 additional-ip ...
>
> unfortunately, it seems that hardware address of eth0 and eth0:1 can not be
> changed independetly.
>
> Basically, there are two major problems: answering ARP requests for
> additional-ip with separate MAC and serving on eth0:1 with different MACs.
>
> First of all I failed to insert new MAC into ARP:
>
> # /sbin/arp -i eth0 -s 10.0.0.55 01:02:03:04:05:06 pub
> # arp -n
> Address     HWtype  HWaddress   Flags Mask    Iface
> ...
> 10.0.0.55   *       *           MP            eth0
>
> and the host continue to anser to ARP's who-has 10.0.0.55 with MAC of eth0:1.
>
> The second problem is that even if on the other host I insert new line into ARP
> cache my first host does not want to serve, e.g., ping requests to that MAC
> address even if I put interface into PROMISC mode (ifconfig reports that I done
> this successfully). Note that tcpdump also shows that the host does receive
> them.
>
> Any ideas how to overcome these problems?
>
>  
I don't think it's a problem... I think that is correct that an 
interface couldn't have mutch more than one MAC address. I think that 
you can simply resolve your problem using the linux module for vlan. You 
can find it here with all howto you need

http://www.it.iitb.ac.in/~it605/resources/Local/HTML/www.candelatech.com/greear/vlan.html

good luck!


--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.289 / Virus Database: 265.4.5 - Release Date: 03/12/2004