Re: Which NIC Will Windows Use?
From: Doug Thews (dougthews_at_removeme.ddconsult.com)
Date: 07/06/04
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Date: Tue, 6 Jul 2004 10:27:31 -0500
I was planning on doing that. What I was wondering is how does Windows
decide which NIC/IP to use if they're both the same length away from the
destination (and yes, they obviously will have the same DG). My guess since
all I'm reading is about "umpredictability" is that the OS will pick the
NIC/IP with the highest bind # in the registry that matches the criteria
(i.e. closest to the destination).
-- Doug Thews Director, Customer Solutions D&D Consulting Services ---------------- Visit my Tech Blog at: http://www.ddconsult.com/blogs/illuminati/ "Phillip Windell" <@.> wrote in message news:%23vHKA0pYEHA.384@TK2MSFTNGP10.phx.gbl... > If you truely need two IP#s, then run both IP#s on the same Nic. Get rid of > the second Nic. > > > -- > > Phillip Windell [MCP, MVP, CCNA] > www.wandtv.com > > > "Doug Thews" <dougthews@removeme.ddconsult.com> wrote in message > news:%23yq9LTLYEHA.1764@TK2MSFTNGP10.phx.gbl... > > OK, I see. I mis-spoke when I said they were on different subnets. They > > are in fact on the same 10.x subnet and they both have the same default > > gateway. > > > > Let's say NIC1= 10.100.1.8 and NIC2=10.100.1.49, with the DG for > > both=10.100.1.1. > > > > Now, there's nothing special set up in the routing table (from my > > perspective), so my question is ... If I have an application that opens a > > port 80 connection to a web service (like Amazon's web services ... on a > > 206.x.x.x address), how does Windows determine which NIC should be used to > > send the packets? My guess is that in this case, the card with the lowest > > binding number will always get called. > > > > Thanks in advance for your help. > > > > -- > > Doug Thews > > Director, Customer Solutions > > D&D Consulting Services > > ---------------- > > Visit my Tech Blog at: > > http://www.ddconsult.com/blogs/illuminati/ > > > > > > > > "Phillip Windell" <@.> wrote in message > > news:uyK6VuDYEHA.2016@TK2MSFTNGP11.phx.gbl... > > > "Doug Thews" <dougthews@removeme.ddconsult.com> wrote in message > > > news:eNkCqD8XEHA.3716@TK2MSFTNGP10.phx.gbl... > > > > I have a Windows 2003 Server with two separate NICs and 2 separate IPs > > > (the > > > > NICs do not support teaming). Both connect to the same gateway, but > are > > > > actually on different private subnets (don't ask me why it was set up > > this > > > > way ... probably one was private and one was public at some point in > > this > > > > server's infancy). > > > > > > Well in this particular case only one will work properly. The Default > > > Gateway *must* be in the same subnet as the Interface. So since you say > > > that they are different subnets but yet the same gateway, that means one > > has > > > an incompatible gateway and will not do anything outside of it own > subnet. > > > > > > When things are correctly configured,..it is the routing table that > makes > > > the decision for which interface to use based on routes entered into the > > > table. The Default Gateway is only for "unspecified routes",...there > can > > bo > > > only **one**. Other nics must leave theirs blank. You can have only > *one* > > > gateway to an "unknown" location via and "unknown" route. All others > must > > > be "known" destinations via a "known" route. The Internet is always > > > classified as an "unknown". > > > > > > -- > > > > > > Phillip Windell [MCP, MVP, CCNA] > > > www.wandtv.com > > > > > > > > > > > >
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