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Author Topic: network puzzle  (Read 1642 times)
Phaėton
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« on: January 27, 2010, 11:23:07 AM »

linksys router

laptop a connects dhcp and gets the address of the modem on the other side of the router .. a Routable real i.p.

laptop b connects and gets a 192.168.1.x address and cant get to the real world... but can reach the router admin page and see the list of dhcp clients connected , guess what laptop a is in the list.

ipconfig /renew  on both machines then ipconfig /all shows renewed leases at the time of /renew

In what case would a router issue its own ip to one client (laptop a) and an inside ip to another? (laptop b)

This breaks the way i thought this all worked.

Where can i even begin trouble shooting this?

Phaėton (from laptop a Cheesy )

Huh?
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« Reply #1 on: January 27, 2010, 11:55:45 AM »

turn on NAT.

none of your laptops should have an external IP.
You obviously have 1:1 or passthrough turned on or something like that.
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« Reply #2 on: January 27, 2010, 12:09:01 PM »

passthrough enabled for a particular machine in the router you mean?

the one that gets the public ip is the one that works.  laptop a

laptop b gets the private ip but a 'dhcp client list with mac addresses'
from laptop b (that can see the router on the inside) viewing the router
admin page shows laptop a connected with a private ip.... Huh?
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Phaėton
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« Reply #3 on: January 27, 2010, 12:10:20 PM »

whats blowing my mind is that i didnt change anything in all three places yet this is happening..
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« Reply #4 on: January 27, 2010, 12:18:51 PM »

"a" would also be getting a private IP because generally speaking the router still has to transit the traffic to "a", and cheaper routers tend to "cheat" to get things done.

The only other thing to check is if "a" is using your router as the gateway, or your ISP. If so, "a" may be causing a conflict.

both a and b should be using your router as the gateway. both dhcp to make things simple. and the router should be NAT. so your router should be getting the public IP, and your two laps should obviously be getting privates. Obviously there must be a setting somewhere for it that you have set wrong.
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