Lan to Lan problem

bigyinjay · 02-21-2006, 04:10 AM

Hi, i have a problem connecting 2 isdn d-link routers together to allow access from one remote site to another so that they can access the linux server. The router at the server site went down and had to be replaced but the settings are not allowing access to the network.the routers can talk to one another and we can ping each of them but we cannot get to the other side them.
The settings are as follows

Remote Router - 192.168.1.100
Subnet Mask - 255.255.255.0
Local Router - 195.76.1.200
Subnet mask - 255.255.0.0
Server to connect to - 195.76.1.1

We have dial-in settings on the local router allowing access from a remote site with a username and password, and dial-out settings on the remote router with the same settings. This part seems to be working okay, but i cannot get past the routers. I was told by d-link that i would need to put in a wan address, but i don't know what or why. I have tried setting dmz hosting for the server and allowing the port 23 to be open, but no good. i know i am missing something, but no idea what.

Any pointers on this would be gratefully accepted

Thanks

aprior · 02-21-2006, 07:03 AM

Do you have any route information about the LAN you're trying to connect to on the opposing router?
For example, it seems that you're connecting from a computer on the 192.168.1.x network to a server on the 195.76.1.x network. The router on the 192.168.1.x network needs to know that in order to get to network 195.76.1.x, it has to send the data to the other router over the ISDN link (using the ISDN network interface's IP address - the address that you're able to ping from the router).
So when a computer on network 192.168.1.x tries to send data to 195.76.1.1, it automatically sends it to the router (192.168.1.100) which then sends it over the ISDN link to the other router, which knows where to send it to from there.

Hope that makes sense.... and if you do have routing information, then I guess you can ignore that little tangent. If you do have routing properly configured, when you do a trace from the client to the server, where does it stop?

bigyinjay · 02-21-2006, 11:36 AM

If i do a trace from a client it goes to the router on its side and then to to remote router. there it stops.

Thanks for your reply

networkspy · 02-23-2006, 08:45 AM

what connection did you use.

if lan to lan problem/; the one problem that 1 inyou ip address in both computer try to put 192.168.0.1 0r 2....

cnajames · 02-23-2006, 11:43 AM

it looks like you have two different subnet mask

stevepayne · 02-23-2006, 12:19 PM

I suspect I'm being thick, but aren't the local and remote IP Addresses the wrong way around?

Apologies for my stupidity if Im wrong. If it's any help in the very few times I've had similar issues I've simple removed all security and firewalls (LAN & WAN) temporarily to see if I can get anywere, then if it does work simply start applying them to find the problem. You may have to specify on the server router which interface to accept incoming connections, to which you'd simply copy it's external IP into.

Anyway, if this is of help - cool. If not I'll bow out quietly...!

aprior · 02-23-2006, 08:14 PM

Ok.... could you post the routing tables here?
What is the IP subnet of the ISDN link?
Also, what model DLink routers are these?

Sorry for all the questions.... there's so many things it could be unless I know the exact setup and what you've already tried.

bigyinjay · 02-27-2006, 09:13 AM

Thanks for all the replies. I couldn't find out what it was and had to configure them accessing the server over the internet through the hosts broadband. It seems to be working fine at the minute.

Thanks for all your answers. It helps to get another point of view when your head is fried.

02-21-2006, 04:10 AM	#1 (permalink)
bigyinjay Registered User Join Date: Feb 2006 Posts: 12 OS: windows xp professional	Lan to Lan problem Hi, i have a problem connecting 2 isdn d-link routers together to allow access from one remote site to another so that they can access the linux server. The router at the server site went down and had to be replaced but the settings are not allowing access to the network.the routers can talk to one another and we can ping each of them but we cannot get to the other side them. The settings are as follows Remote Router - 192.168.1.100 Subnet Mask - 255.255.255.0 Local Router - 195.76.1.200 Subnet mask - 255.255.0.0 Server to connect to - 195.76.1.1 We have dial-in settings on the local router allowing access from a remote site with a username and password, and dial-out settings on the remote router with the same settings. This part seems to be working okay, but i cannot get past the routers. I was told by d-link that i would need to put in a wan address, but i don't know what or why. I have tried setting dmz hosting for the server and allowing the port 23 to be open, but no good. i know i am missing something, but no idea what. Any pointers on this would be gratefully accepted Thanks

02-27-2006, 09:13 AM	#8 (permalink)
bigyinjay Registered User Join Date: Feb 2006 Posts: 12 OS: windows xp professional	Thank you Thanks for all the replies. I couldn't find out what it was and had to configure them accessing the server over the internet through the hosts broadband. It seems to be working fine at the minute. Thanks for all your answers. It helps to get another point of view when your head is fried.

02-21-2006, 07:03 AM	#2 (permalink)
aprior Registered User Join Date: Jan 2006 Posts: 75 OS: Windows XP Professional, Windows 2000 Professional, Windows 2000 Server	Do you have any route information about the LAN you're trying to connect to on the opposing router? For example, it seems that you're connecting from a computer on the 192.168.1.x network to a server on the 195.76.1.x network. The router on the 192.168.1.x network needs to know that in order to get to network 195.76.1.x, it has to send the data to the other router over the ISDN link (using the ISDN network interface's IP address - the address that you're able to ping from the router). So when a computer on network 192.168.1.x tries to send data to 195.76.1.1, it automatically sends it to the router (192.168.1.100) which then sends it over the ISDN link to the other router, which knows where to send it to from there. Hope that makes sense.... and if you do have routing information, then I guess you can ignore that little tangent. If you do have routing properly configured, when you do a trace from the client to the server, where does it stop?

02-21-2006, 11:36 AM	#3 (permalink)
bigyinjay Registered User Join Date: Feb 2006 Posts: 12 OS: windows xp professional	If i do a trace from a client it goes to the router on its side and then to to remote router. there it stops. Thanks for your reply

02-23-2006, 08:45 AM	#4 (permalink)
networkspy Registered User Join Date: Feb 2006 Location: Philippines Posts: 27 OS: Windows 2000 Professional	what connection did you use. if lan to lan problem/; the one problem that 1 inyou ip address in both computer try to put 192.168.0.1 0r 2....

02-23-2006, 11:43 AM	#5 (permalink)
cnajames Registered User Join Date: Feb 2006 Posts: 3 OS: WINDOWS XP	it looks like you have two different subnet mask

02-23-2006, 12:19 PM	#6 (permalink)
stevepayne Registered User Join Date: Nov 2004 Location: UK Posts: 59 OS: Win 2000 / XP / 2003 / Vista	I suspect I'm being thick, but aren't the local and remote IP Addresses the wrong way around? Apologies for my stupidity if Im wrong. If it's any help in the very few times I've had similar issues I've simple removed all security and firewalls (LAN & WAN) temporarily to see if I can get anywere, then if it does work simply start applying them to find the problem. You may have to specify on the server router which interface to accept incoming connections, to which you'd simply copy it's external IP into. Anyway, if this is of help - cool. If not I'll bow out quietly...!

02-23-2006, 08:14 PM	#7 (permalink)
aprior Registered User Join Date: Jan 2006 Posts: 75 OS: Windows XP Professional, Windows 2000 Professional, Windows 2000 Server	Ok.... could you post the routing tables here? What is the IP subnet of the ISDN link? Also, what model DLink routers are these? Sorry for all the questions.... there's so many things it could be unless I know the exact setup and what you've already tried.