IP Conundrum?

[jgoodman00]

I am trying to utilise wireless hotspots to allow my users to establish a VPN with their pocket pc's & from wireless hotspots.

After much difficulty I have managed to get a connection, but run into an ip problem:

Our LAN works on the address pool:
192.168.1.10 - 192.168.1.50, with a subnet of 255.255.255.0

When I goto a hotspot, most of those give out addresses in the range 192.168.0.1 & upwards.

When I establish a connection this causes a problem because any connection attempts look to the local hotspot network, rather than the remote network.

I am aware that I could change our address pool to something else, but I feel I will always be second guessing the hotspot DHCP servers.

Is this observation correct?
Is there a simple solution?



James Goodman MCSE, MCDBA

http://www.angelfire.com/sports/f1pictures

 

[snapicus]

Since you are only using a small portion of the full /24 subnet you have configured, have you considered setting the hotspots up as bridges where they would DHCP off your main ip pool? Or is that even possible with the type of access point you are using?

Also, you may try assigning a block of ip addresses from your LAN subnet to the hotspots where everyone would share the same subnet.

 

[grandpubah]

Why not turn off dhcp in the AP and let the wireless hosts get their addresses from whatever gives them on your LAN. Use the AP as a bridge and not a router.

Jon

 

[jgoodman00]

By wireless hotspots I mean public hotspots where I have no control of the addresses they use or give out...

James Goodman MCSE, MCDBA

http://www.angelfire.com/sports/f1pictures

 

[minxca]

Hi,
How big is your network?
Can you change the network ID at the office to 10.x.x.x or 172.x.x.x?
I'm sure if you change it you won't have any problem because a lot of hot spot and soho use 192.168/16

 

[jgoodman00]

Can you change the network ID at the office to 10.x.x.x or 172.x.x.x?

But I am still left second guessing the ip-configuration of the hotspots?

I thought this would be the case.

Cheers,

James Goodman MCSE, MCDBA

http://www.angelfire.com/sports/f1pictures

 

[minxca]

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When I goto a hotspot, most of those give out addresses in the range 192.168.0.1 & upwards
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You knew it!

 

[vbrocks]

You can configure the dhcp servers to give them the correct addresses. All you need is the mac addresses of the nics in the pocket pcs. Then you can specify on the dhcp server what addresses to give each nic......

 

[minxca]

vbrocks, he has to change his network ID. His DHCP gives the correct address but because most of the hotspot use 192.168/16 and his office uses 192.168.1/24. Try this at home and then check route print.

 

[vbrocks]

winoto,
I'm just saying that he does not have to second guess the outcome of the dhcp addressing. Once he comes up with the proper netID and subnet to use, he can specify the correct one in dhcp......