[Nottingham] NIC MACs aliases & IP aliases

[Martin]

Martin wrote:
> [---]
>>> Is there a "arp & ping response" utility that I can attach to a tap to try?
>> arping :)
> 
> Yes but the wrong way around! :-/
> 
> A tap receives an external arping packet ok (as shown using tcpdump). 
> Then does nothing with it.
> 
> So, when using arping on some remote host to the local host with the 
> taps, what can I hang onto the tap on the local host to listen for an 
> arping and send an arping reply back? :-)

Anyone got some code or any pointers that I can plug in to the multimac 
code to generate arp responses and also ICMP ping echos?

A bit of surfing so far suggests that the arp and ping code is 
abstracted in the kernel and can be called up if I make my own psuedo 
driver for an interface... Anything like that already available?

tap + arp + ping?


Or is there no problem to having a src IP + src MAC_tap pair that is 
different to the return dst IP + dst MAC_eth pair? (That indeed doesn't 
seem to matter on my network. All that seems to be required is for the 
arp-who-has to pick up the dst MAC_eth.)


Help?

Cheers,
Martin

-- 
----------------
Martin Lomas
martin at ml1.co.uk
----------------