0

I have a Windows PC with 2 NICs; one NIC connects this machine to the local LAN while the other NIC connects this machine directly to an X-ray machine (which I'll call the RayLAN).

So my question is this: Is it possible that an IP address on the local LAN would conflict with the statically assigned IPs on the RayLan? I'll rephrase with more specificity: If the RayLAN NIC was assigned 192.168.1.200 and some other PC on the local LAN happened to have that same IP, would that be a problem? My gut says no as these are two separate networks that are not bridged.

Thanks! Barry

Edit - 1/8/21 - Looks like the two NICs are peacefully co-existing. Apparently, one of them was dying so replacing it resolved the issue. Are both NICs in this PC using the same IP address? I can't say at this point (especially since COVID) as I'm not setting foot into a dental office filled with open mouths! I'm retiring in a couple of months anyway so "eff it". :D

rumplestiltskin
  • 1
  • 4

3 Answers3

1

Both your PC's links need to use distinct IP subnets without overlap. If the RayLAN NIC uses 192.168.1.200/24 then you can't use any address from 192.168.1.0/24 anywhere else in your network without causing problems. You don't even need an IP address collision, a subnet address collision already is a problem.

Specifically, your PC wouldn't know where to route packets destined for 192.168.1.0/24 but not to the RayLAN. Since 192.168.1.0/24 is directly connected it would attempt to contact any 192.168.1.0/24 destination directly via ARP and without using a gateway.

When both NICs' subnets are supposed to be separate each one needs a distinct, non-overlapping subnet address that is not used elsewhere.

There are ways to (somewhat) make everything work despite the collisions (like using longer subnet masks/prefixes, specific low-metric routes, or even NAT) but your life will be much easier if you sort out the address problem once and for all.

Zac67
  • 90,111
  • 4
  • 75
  • 141
0

Both NIc adapter address should be configured with different IP address . And both NIC cards has to connected with different network switches . The recommended pratice is second NIC default gateway should be kept empty . For routing traffic specific route entry should be added manually pointing to default gateway ip address .

Sagar Uragonda
  • 844
  • 1
  • 17
  • 74
-2

It won't cause any conflict if they are connected to different network switches.

Global
  • 1
  • 2