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Old 01-25-2003, 05:02 PM   #1
Registered: Apr 2002
Location: St. Paul, Minnesota
Distribution: UbuntuStudio, Ubuntu
Posts: 357

Rep: Reputation: 31
5 DHCP IPs, but 7 computers - approach 2

Can I run a Dual - NIC - linux (FYI: my linux is a Sun Sparc) - with both NIC cards having the same IP address? Or will the kernel panic in the confusion about not knowing how to route it?

This comes - in part - from my having dealt with Cisco router hardware that can use two interfaces, and still act as a single internet address. It also comes from my greed of wanting my windows/gaming PCs to have live IP addresses, but still have firewall protection (so I don't get NetBIOS spam while gaming).

I basically want to take my DHCP provided IP address on a 10Base, assign the same to my 100Base, and then serve my remaining 4 DHCP IPs through DHCP relay requests. I could then use another computer entirely to do NAT for the odd-computers-out. This would be similar to having External (linux/fw), DMZ (DHCP relay) and Internal (NAT).
Old 01-25-2003, 05:24 PM   #2
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Registered: Jan 2003
Location: Portland, OR USA
Distribution: Slackware, SLAX, Gentoo, RH/Fedora
Posts: 1,024

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H/W router like Cisco is a little different, I think Linux makes you do two different could put them on the same subnet (like and and make the kernel bridge them together (think layer 2 switch with 2 IP addresses and a little more overhead.) Which I know the kernel supports but have honestly never tried.


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