Two identical networks sharing 1 printer

Hi all
I was just asked to do the following for two offices that share the same space, and i said i´d look into it.

basically there are
two zyxel P-660HW-D1 routers set up excatly the same way using the default 192.168.x.x ip addresses.

there are only a few computers on both networks and on the network that needs access to the printer there are 3 so they are all connected directly to the built in switch of the router, leaving one extra port.

the other network has 5 computers and some other devices and the printer so it has a switch, and the switch is managed so i guess it should be possible to create some sort of routes but the problem being that i don´t know how to so i was hoping someone here might be able to walk me through the proccess using the equipment we have at hand.
http://www.netgear.com/Products/Switches/FullyManaged10_100Switches/FSM726.aspx?detail=Specifications

to summirize :

2x zyxel P-660HW-D1 routers set up identically both using default ip addresses (192.168.1.1)
1x Netgear FSM726 managed switch
1x network printer connected to the managed switch using ip 192.168.1.108

both routers are in the same closet with the switch so interconnecting should not be a problem if that is what is needed.
any suggestions or better yet if possible a how-to for configuring the netgear switch if that is the route i should take.
Hoddi1Asked:
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twohawksCommented:
Hi Hoddi,
These are two ADSL Routers, so you can clarify please... does each office have their own (independent of one another) internet service being provided for by each's router?
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Hoddi1Author Commented:
yes, there are two internet connections
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JeffSchaperCommented:
If they trust each other, I'd turn off DHCP on the networks and use stati, and change the IP Address of one of the routers to 192.168.1.2 and change their default gateway to their respective routers. Then you can interconnect them. It will mean that both networks are now one and can see each others network devies, including the computers.
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JeffSchaperCommented:
Log onto your NetGear FSM276, Go to Switch, click on VLAN and select the Advanced option. On VLAN Configuration type is a number, name for the network and select static, then click add down the bottom right corner. Add a second network with a different number and name but also with static. Then click on VLAN membership under VLN Config. The default VLAn1 should be tagged all, the first office will have tagged the number of ports it needs plus the port of the printer. Same with the second office. Tag the ports where it's devices are connect plus the printer port.
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Hoddi1Author Commented:
Thanks Jeff
but would it at all be possible to accomplish this by having DHCP on for both routers ?
They sometimes have guests that need internet access that may not know how to configure the ip addresses.
the most important thing is that they don´t use each other´s internet connection.

the only device both networks need to see is the printer but i guess it doesn´t hurt if they see each other´s addresses aswell.

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JeffSchaperCommented:
I've never tested 2 DHCPs on a VLAN switch like that so cannot promise, but give it a go. Also you might want to divide the VLANed port down the switch, so if any visitors come they can be connected to "their" side of the switch.
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lanboyoCommented:
You are going to have a bit of a problem connecting these networks, If you put all the pcs and printer into the same vlan then you are going to have two dhcp servers and the pcs will pretty much randomly choose which dhcp server to talk to. The DHCP server will not talk to each other and both assign addresses in the same range unless you make some kind of change.

What you can do is give the routers different IP addresses (192.168.1.1 , 192.168.1.2)  Give them different IP DHCP space to hand out ( 192.168.1.150 -192.168.1.199 , 192.168.1.200 -192.168.1.250 ) and assign most of the devices to thieir appropriate local network manually in the ranges below  192.168.1.150.  A device will get an address from the fastest router to respond with a DHCP address, and will use the internet connection of the device that handed them the DHCP. All of them should locally be able to connect to the printer as they do not need to go to the router to do that. The key is to avoid address overlap.
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JeffSchaperCommented:
The switch can be divided into 2 separate VLANs. If he keeps 1 DHCP on its side the other on its it should be OK. Putting the printer in a shared VLAN port should do the trick.

I've done it on other switches but not this particular switch.
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lanboyoCommented:
Perhaps if the switch is capable of community vlans. (which this one is not)  You would still need different DHCP ranges to make sure the printer could talk to whomever it needed to. You could share the printer to the internet by forwarding ports 515 and 9100 to the printer and building the printer connection on the side without the printer to the external IP.
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Hoddi1Author Commented:
Hi all and thanks for your suggestions, sharing the printer to the internet sounds like it could work, i didn´t think of that solution, i´l let you know how it goes after the weekend
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Hoddi1Author Commented:
Hi
ok i have now forwarded port 515 and 9100 to the internal ip address of the printer (HP LaserJet 2300)
however i am unable to print on it over the internet when i map it as a printer using the WAN ip address of the internet connection.
i´ve disabled the firewall on the zyxel router
but other than that i am unceartain of what could cause this or how to proceed next ?
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twohawksCommented:
You do realize that if the internet service for either Lan goes down that during that time no one will be able to print on the local lan?  May seem obvious, but it should be mentioned as it is important to weigh in on % acceptable downtime ...if it were a T1 or Fractional I wouldn't be too concerned, I see those go offline rarely, but I see dsl and cable go offline often, and the minute they cannot print they are going to be in your hair.
Just my 2 sense ;^)


Also, I would think the TCP printing feature for the so-called jetdirect on that particular model runs on simply port 80 (unlike a modern jetdirect) ...no??
I would set up a unique port listener on the router, with a relevant redirect through the router and switch to port 80 at the printer's ip.  Then PC's have the printer setup at the external IP at the intended listening port... something along those lines.


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twohawksCommented:
Hmmm... You know, I double checked that port issue and I am uncertain about that... although the documentation supports what I said, the eio specification for what was built into that printer does mention port 9100 (you'd think they'd mention that in the manuals for that model).

I wonder if your problem has to do with printing from residents that are sending out over the same port that is listening (outgoing/incoming port conflict)?  I would try setting up a PC on the same internal lan as the printer to talk to it over port 9101, and have your router redirect the calls to port 9101 to port 9100 and see if the printer responds.


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JeffSchaperCommented:
What about giving the printer an IP Address that is common to both networks and plugging it into a promiscuous port so both VLANs can see it?
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Hoddi1Author Commented:
....
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