Discussion:
Two PC's on crossover kills WiFi
(too old to reply)
just bob
2008-04-15 23:37:11 UTC
Permalink
A few minutes later

Had to create two local admin accounts on each machine to use for
authentication since a DC is not present, added each machine name and IP to
each others hosts file (even ping seems slow without this) and used map
network drive with login with other name. Fairly pathetic but it works
bunch of hoops I had to go through but it does work OK.

Is there an easier way?
Choice 1 worked nice except.... XP will not let me share files.
I can ping each other now and both machines can access the internet, so
your tip worked. I just do not know how to share files between domain
members when they are not on the domain.
Any ideas?
Thanks again!
Choice #1 - The easy way
Manually configure The TCP/IP specs of the nics you're using with the
crossover cable.
Make them the same subnet with each other, but different than the
wireless Nics
Leave the Default Gateway blank,..it is used for crossing subnets and
they are not crossing subnets,..it is therefore not supposed to be
used,..leave it blank
Choice #2 - The long annoying and possibly less stabile way
Change the binding order of the nics. Set the WiFi nic as the first.
I'll use XP as the example,..you can translate it to Vista if you run
Vista.
Properties of Network Places-->
Advanced from the Top Menu-->
Advanced Settings from the Dropdown Menu-->
Use the side arrows at the Upper box the set the Nic you want to be at
the top
Now it should "favor" that nic if they both have conflicting Default
Gateways
Default Gateways are supposed to be treated as *global* for the whole
machine, hence there should only be one on one nic. This situation is an
example of why a machine should never have more than one Default Gateway
unless the Default Gateway IP#s are in the same subnet and are bound to
the same Nic (used for Dead Gateway Detection, see below). That has been
the Rule for years since TCP/IP was invented,...things haven't changed
much.
If it doesn't work after this then you just simply will not be able to
dependably use the Wifi at the same time as using a crossover between the
wired nics. You'll have to pick one or the other at a given moment by
disabling the other.
I hope the links are still good,...they are getting kind of old.
Q128978 - Dead Gateway Detection in TCP/IP for Windows NT
http://support.microsoft.com/support/kb/articles/Q128/9/78.ASP
Q171564 - TCP/IP Dead Gateway Detection Algorithm Updated for Windows NT
http://support.microsoft.com/support/kb/articles/Q171/5/64.ASP
Q1157025 - Default Gateway Configuration for Multihomed Computers
http://support.microsoft.com/support/kb/articles/Q157/0/25.ASP
Q175767 - Expected Behavior of Multiple Adapters on Same Network
http://support.microsoft.com/support/kb/articles/Q175/7/67.ASP
--
Phillip Windell
www.wandtv.com
The views expressed, are my own and not those of my employer, or
Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------
Connecting two PC's with a crossover cable kills the wifi internet.
When we travel we usually have two laptops connected to the same public
WiFi to check email and surf the web but we also need to share many very
large files between the two laptops. Since both computes have gigabit
NIC's I tried using a crossover cable to link them to get better speeds
than over WiFi.
Both laptops are identical Dell D630 with internal Wifi adapters.
Laptop-A's GB NIC is assigned 172.16.16.1 and Laptop-B is 172.16.16.2,
subnet mask is 255.255.255.0 and gateway is themselves.
When I do this the two PC's see each other just fine but the WiFi to the
internet stops working. I believe it is a routing to default gateway
issue but I'm not sure how to cure this. How do you force the PC to use
the WiFi as the default gateway, if that will solve the problem? I have
tried using the route command but even though I craft the command
statement exactly as the help doc says it comes back with an error.
route add 0.0.0.0 MASK 255.255.0.0 192.168.1.10
If you have any ideas how to make this work please let me know!
Thanks,
-Bob
Jack (MVP-Networking).
2008-04-16 00:29:47 UTC
Permalink
Hi
May be this can Help, http://www.netsetman.com/index.php?s=nsm
Jack (MVP-Networking).
Post by just bob
A few minutes later
Had to create two local admin accounts on each machine to use for
authentication since a DC is not present, added each machine name and IP
to each others hosts file (even ping seems slow without this) and used map
network drive with login with other name. Fairly pathetic but it works
bunch of hoops I had to go through but it does work OK.
Is there an easier way?
Choice 1 worked nice except.... XP will not let me share files.
I can ping each other now and both machines can access the internet, so
your tip worked. I just do not know how to share files between domain
members when they are not on the domain.
Any ideas?
Thanks again!
Choice #1 - The easy way
Manually configure The TCP/IP specs of the nics you're using with the
crossover cable.
Make them the same subnet with each other, but different than the
wireless Nics
Leave the Default Gateway blank,..it is used for crossing subnets and
they are not crossing subnets,..it is therefore not supposed to be
used,..leave it blank
Choice #2 - The long annoying and possibly less stabile way
Change the binding order of the nics. Set the WiFi nic as the first.
I'll use XP as the example,..you can translate it to Vista if you run
Vista.
Properties of Network Places-->
Advanced from the Top Menu-->
Advanced Settings from the Dropdown Menu-->
Use the side arrows at the Upper box the set the Nic you want to be at
the top
Now it should "favor" that nic if they both have conflicting Default
Gateways
Default Gateways are supposed to be treated as *global* for the whole
machine, hence there should only be one on one nic. This situation is an
example of why a machine should never have more than one Default Gateway
unless the Default Gateway IP#s are in the same subnet and are bound to
the same Nic (used for Dead Gateway Detection, see below). That has been
the Rule for years since TCP/IP was invented,...things haven't changed
much.
If it doesn't work after this then you just simply will not be able to
dependably use the Wifi at the same time as using a crossover between
the wired nics. You'll have to pick one or the other at a given moment
by disabling the other.
I hope the links are still good,...they are getting kind of old.
Q128978 - Dead Gateway Detection in TCP/IP for Windows NT
http://support.microsoft.com/support/kb/articles/Q128/9/78.ASP
Q171564 - TCP/IP Dead Gateway Detection Algorithm Updated for Windows NT
http://support.microsoft.com/support/kb/articles/Q171/5/64.ASP
Q1157025 - Default Gateway Configuration for Multihomed Computers
http://support.microsoft.com/support/kb/articles/Q157/0/25.ASP
Q175767 - Expected Behavior of Multiple Adapters on Same Network
http://support.microsoft.com/support/kb/articles/Q175/7/67.ASP
--
Phillip Windell
www.wandtv.com
The views expressed, are my own and not those of my employer, or
Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------
Connecting two PC's with a crossover cable kills the wifi internet.
When we travel we usually have two laptops connected to the same public
WiFi to check email and surf the web but we also need to share many
very large files between the two laptops. Since both computes have
gigabit NIC's I tried using a crossover cable to link them to get
better speeds than over WiFi.
Both laptops are identical Dell D630 with internal Wifi adapters.
Laptop-A's GB NIC is assigned 172.16.16.1 and Laptop-B is 172.16.16.2,
subnet mask is 255.255.255.0 and gateway is themselves.
When I do this the two PC's see each other just fine but the WiFi to
the internet stops working. I believe it is a routing to default
gateway issue but I'm not sure how to cure this. How do you force the
PC to use the WiFi as the default gateway, if that will solve the
problem? I have tried using the route command but even though I craft
the command statement exactly as the help doc says it comes back with
an error.
route add 0.0.0.0 MASK 255.255.0.0 192.168.1.10
If you have any ideas how to make this work please let me know!
Thanks,
-Bob
Phillip Windell
2008-04-16 15:54:41 UTC
Permalink
Post by just bob
Had to create two local admin accounts on each machine to use for
authentication since a DC is not present, added each machine name and IP
to each others hosts file (even ping seems slow without this) and used map
network drive with login with other name. Fairly pathetic but it works
bunch of hoops I had to go through but it does work OK.
The "workgroup model" is always "pathetic" to me :-)

See Jack's post. He has the links that will help with that stuff. I got
the networking side of things cleared up,..I'm satisfied with just that.
--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
-----------------------------------------------------
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