Foreign Address on LAN

[wtmckown]

A vendor of automated laundry equipment has placed a couple of PC's on our site and one of them has a database that I need access to. These machines are networked together via tcp/ip and joined at a hub that the vendor provided. We connected the hub to our LAN but the vendor refuses to change addresses to match our address scheme. Our local range is 172.20.247.0 - 172.20.247.255. The new machines are 192.168.0.21 and 192.168.0.34. Is is possible to access them given these conditions?

 

[manarth]

anytime you need to access an IP address which lies outside your subnet, you need a router.

<marc> i wonder what will happen if i press this...[ul][li]please give feedback on what works / what doesn't[/li][li]need some help? how to get a better answer: faq581-3339[/li][/ul]

 

[Comstocb]

One of those Linksys DSL routers should work fine and what do you know, the PC's you want to access are on private IP space 192.168.0.x Just plug the hub into the backside of the router and then uplink to your network assigning a 172.20.247.x address to the uplink side of the router. 99 bucks or less and a little reading will put you in business. Of course, now you have just exposed your network to their network and vice versa. Now you need a firewall. The DSL router has one built in so if this is a concern, you will need to flip the router around and uplink into their network (192.168.0.x address on the uplink side, you will need to ask the vendor for one) and configure the backside of the router for your addressing scheme. You'll need to adjust the route tables and probably disable DHCP on the router for starters. This will take some thought and work but it can be done.

 

[shmoes]

Are you sure the new PC's are set to DHCP? sounds like they're staticly configured.

You mentioned they're all connected vIA a hub. so they're all local together. where's the DHCP coming from?

router or server? the server will only assign DCHP to computers in the domain.

~Shmoes

I lay claim to nothing and everything. My words may be wisdom or disaster. In the end you make a choice. Noone is perfect.

 

[Serbtastic]

wtmckown doesn't state anywhere that the new pc's are set to DHCP. Where did you read that?

 

[shmoes]

Our local range is 172.20.247.0 - 172.20.247.255

I assume they're assigned by DHCP, otherwise he would have mentioned he was in there and changed them manually

and by the sounds of it the other computers are just daisychained from one hub to another.



~Shmoes

I lay claim to nothing and everything. My words may be wisdom or disaster. In the end you make a choice. Noone is perfect.

 

[wtmckown]

Thanks for the tips. I actually added a second nic to one of the vendor's pc's and bound it to tcp/ip and set it to ask for an address from the address server in the 172 network. This gives me access to one machine at least in the 192 network.

 

[manarth]

How the IPs are assigned doesn't matter.

Either wtmckown can change his IPs to 192.168.0.x or get the the vendor to change his IPs to 172.20.247.x, or use a router between the two subnets.

Without knowing how the IPs are assigned (all static, all dynamic, or a combination of both) it's hard to offer advise on how to go about changing the IPs - if that's the route wtmckown wants to choose.

<marc> i wonder what will happen if i press this...[ul][li]please give feedback on what works / what doesn't[/li][li]need some help? how to get a better answer: faq581-3339[/li][/ul]

 

[shmoes]

Oh, my mistake, I'm sorry I misread that the VENDOR refused to change his IP address scheme. I didn't realize there was an actual person not willing to change the DHCP.. I was thinking the computer themselves refused to obtain the proper IP address.

~Shmoes

I lay claim to nothing and everything. My words may be wisdom or disaster. In the end you make a choice. Noone is perfect.

 

[Serbtastic]

What about adding a second IP (192.168.0.x) to one of the machines on your lan that you want to access the vendor's pcs with?

 

[manarth]

or use Win NT / 2000 server's RRAS (routing & remote access service).

2 NICs in an NT server = router. actually, I think NT workstation may also offer this. darn no books in front of me to check! I'll get back to you later...

to configure the routing system the command is &quot;route add&quot; with the &quot;-p&quot; for permanent entries.

<marc> i wonder what will happen if i press this...[ul][li]please give feedback on what works / what doesn't[/li][li]need some help? how to get a better answer: faq581-3339[/li][/ul]