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2 Cable Modems on same net causing problems

Posted on 2002-06-15
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Last Modified: 2013-11-30
I have 1 cable modem which is connected to a linksys wireless router / 4 port switch
my neighbor has a cable modem and a 4 port router/ switch
problem: when we connect our 2 networks together, it goes crazy, all the lights start flashing real fast on all routers, my end and his.
I cannot access the internet but he can, I unplug the connection to his network and everything is fine, when I unlplug his cable modem or mine and we can access each others network fine and the lights blink normally, plug it back in everything goes haywire again????

Any help would be appreciated, TIA.
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Question by:lilwizard77
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by:stevenlewis
ID: 7081042
I suspect that both routers are trying to act as dhcp servers using the same scope. try shutting off the dhcp server in one of them
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by:escheider
ID: 7081057
Good suggestion steve.

You could also just put another router in between your two subnets to prevent broadcasts from going from one subnet to another.
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by:lilwizard77
ID: 7081551
dhcp is shut off on both, I have a win 2000 server that is handling dhcp.
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by:lrmoore
ID: 7081768
How, exactly are you connecting your two networks together? Running CAT5 from one house to the other?
What is the default gateway being given out by your DHCP server? Do both routers have the same LAN IP address? Linksys by default is 192.168.1.1
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by:lilwizard77
ID: 7082746
all my PC's have a nailed ip except my laptop which uses dhcp from my server range on my network is 10.11.0.1-9
all his PC's have a nailed ip of a range 10.11.0.10-20
and yes the two are connected via a cat-5 cable run between the 2 houses. the default gateway given out is my router which is 10.11.0.3, this does not create a problem because al his PC's have a nailed IP and are set to his router as the gateway.
Any help is appreciated, TIA
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by:scraig84
ID: 7083619
What is the IP address of your neighbor's router?  Are there any routing protocols enabled on either or both routers, such as RIP?  If so, what happens when you shut them off?
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by:lilwizard77
ID: 7083638
the ip of my neighbors router is 10.11.0.13 and none of the routing protocols are used.
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by:scraig84
ID: 7083720
The Cat5 you use to connect the switches - are you using a crossover between 2 regular ports or do you use a straight-through cable and use an uplink port on one of them?
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by:lilwizard77
ID: 7083738
I am using the uplink port on 1 of them with straight through cable.
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by:scraig84
ID: 7083752
When you connect the two, you say you can't get to the Internet, but what else fails and what works?  Can you ping your default gateway?  Can you ping other PC's on the local switch?  Can you ping your neighbor's router?  Can you ping machines on his switch?  What about his side - what works and does not work on that side?  If everything works locally, and you try to ping hosts on the Internet, can you ping them IP address?  If yes can you ping the same hosts by name?
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by:lilwizard77
ID: 7083771
I must change that sorry, I can get to the internet it was just that the fist time I tried it I was on my laptop (wireless) and it was just creating so much chatter to all workstations that it was not getting out before it timed out, I can get out to the internet and so can he but it is extremely slow. So I can get to everything on his side and mine, and to the internet, and so can he, but it is just very slow cause of all the chatter when both the modems are connected to the network.
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by:CleanupPing
ID: 9155602
lilwizard77:
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