networking question

Posted on 2003-03-03
Medium Priority
Last Modified: 2010-03-19
How do I setup my network so that I have 2 default gateways on 1 class c.

Also, is it possible to segment my network into four different subnets with 4 gateways so that I can split my class c up for four clients -- that way if any one client violates our AUP  - only his ip's are rbl.

Question by:pmullen1
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Expert Comment

ID: 8063706
Do you need to know whether you can specify one IP as a default gw for some clients, and another as a default gw for other clients?
Or do you need to know whether you can specify two IPs as def gw for all the clients?
The first is do able, while the second is not. (as is obvious from the dictionary meaning, there can be only one default)
You can subnet a network into many segments, each with its own gateway, but if you need to allow the machines in the different subnets to talk to each other, then you will need to put all these "gateways" into multiple subnets.
LVL 13

Expert Comment

ID: 8064220

sorry to disagree with you, but you're wrong.  Windows NT, 2000 and XP for starters support dead gateway detection.  This means you can specify more than one default gateway and clients will detect if one is not responding and switch to the second.

The problem with subnetting is that you immediately lose a number of address.  For 4 subnets you would segment as follows:

network address could yield 6 useable networks. (you could use 33-62) (you could use 65-94) (you could use 97-126) (you could use 129-158) (161-190) (191-222)

the subnet mask would be

the best convention would be to use the first or last adddress on each subnet as default gateway


Expert Comment

ID: 8066598
As far as the multiple gateways, suhasjs is correct.
Four subnets for a class c network.

Starting network address
Mask  (26 bit)

Host ranges for each: to to to to

Once you have your four subnets, if you want the hosts on each subnet to communicate, you will need route traffic between them.  Which, I suppose, your gateways could do.

Accepted Solution

Baddog earned 220 total points
ID: 8066889
I agree with hstiles, W2K, XP can use the dead gateway detection whereby the gateways and their metric are entered in the advanced configuration of TCP/IP. If a gateway is not found it will step to the next gateway based on the list. Further reading:


Good reading


Expert Comment

ID: 9153283
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