[Gllug] fake ICMP replies?

[Julian Somers]

Hi All,

I have this linux box that is set up to connect via GPRS, and provide  
NATted services to a LAN. This is installed on a ship, so it roams  
various GPRS providers.

Some of these GPRS networks (eg Vodaphone UK) do not forward ICMP  
packets.

Enter a mail application, running on a windows machine behind this  
linux box, that insists on pinging its mail server before asking for  
mail; if the ping fails, it gives up. So if the ship moves into one  
of these ICMP-free GPRS networks, the mail server stops working.

Is there a way I can make this linux router 'fake' ICMP responses, so  
that this application always gets past the ICMP test?

I have an idea that I can do it with an IPtables rule, but at this  
time on a friday, it's just not coming together...

Thanks!

Julian


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