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routers and their address

Posted on 2007-12-03
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We have quite a few routers setup, should I change their addresses and what all can I make their addresses?  Right now I think they are all set to 192.168.1.1
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Question by:ThomasBallardIT
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If these all are on a LAN, the 192.168.1.? (1-254) are probably OK. How to change and what to change to depends on DHCP, current domain scheme etc. Send more info if this does not answer your question.
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by:ngravatt
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use anything in the private addressing range:
The IPv4 blocks
 10.0.0.0        -   10.255.255.255  (10/8 prefix)
 172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
 192.168.0.0     -   192.168.255.255 (192.168/16 prefix)

the 10.0.0.0 provides the most addresses.
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by:ThomasBallardIT
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We set most computers up manually, so no dhcp.  Would I set the computer to look at their closest router or the final router it passes through?
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by:lacrewga
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DIfficult question to answer without knowing how you have everything set up. Closest will probably be OK.
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by:ngravatt
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yeah, depends on how you have it all setup.  how many routers/switches do you have? Are there separate VLANs.  you could use a different router/default gateway for each VLAN.

i would suggest following the Cisco Network Design Module:
http://www.networknewz.com/2004/0206.html

you can configure the default gateways and use HSRP to provide redundancy.
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by:Engineer_JO
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1st router : 192.168.1.1
                 and it is the default gateway for the workstations with IPs 192.168.1.2 - 192.168.1.254
               
2nd router: 192.168.2.1
                 and it is the default gateway for the workstations with IPs 192.168.2.2 - 192.168.2.254

3rd router : 192.168.3.1
                and it is the default gateway for the workstations with IPs 192.168.3.2 - 192.168.3.254

Best Luck
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by:ThomasBallardIT
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Here is a basic look at how we have it set up.
Say we have 10 computers people use for work.  
6 of these computers will connect to a router then travel to the master switch then through another router.
The other 4 computers go straight to the switch and into a router.  

This is a pretty small company with only about 20 users.  So it doesn't get real complex.
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by:ngravatt
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then use the closet router as the default gateway.  that router can then send the traffic to the correct location.
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by:lacrewga
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Do all the computers go thru the same "Master Switch" and then out of the same router to internet?
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by:ThomasBallardIT
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yes they all head to this switch.
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by:lacrewga
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If everything is working, leave it alone. It sounds OK.
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