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Multiple Secondary IP for fastethenert port

Im currently using a 3661 router and just recently install two module (2 10/100 Ethernet 2 WAN card). Im currently using the 10/100 ports to connect to my fiber switch using fiber to UTP converter. This is to enable client to get IP Dynamically. On my 10/100 port I enable ip helper-address x.x.x.x and the IP address of the port is 10.1.144.1

I did a route "ip route 10.1.144.0 255.255.252.0 FastEthernet5/1" which is 10.1.144.1

We did change some of the clients from Static IP to DHCP until 10.1.144.xxx runs out. When it moves to 10.1.145.xxx and the other subnets, the PC's (Running Win NT and Win 95) manage to get an IP from the DHCP server BUT wont get the Default gateway which is 10.1.144.1 (As define on our DHCP server scope). Upon reading the knowledge base for Micrsoft I found out that these versions (NT, 95 ) will only get Default gateway if it is on the same subnet.

I have configure a secondary IP for 10.1.144.1 and it is 10.1.145.1 which will cater for 10.1.145.xx. Is it possible if we could configure the port to have multiple secondary address..like 10.1.146.1 and 10.1.147.1

Need advice

4 REPLIES
Bronze

Re: Multiple Secondary IP for fastethenert port

Hi

Yes you can have more then one secondary ip address on the FastEthernet.

I'm not shure if that's your question, but it would look like this:

interface FastEthernet0/0

ip address 10.1.147.1 255.255.255.0 secondary

ip address 10.1.146.1 255.255.255.0 secondary

ip address 10.1.145.1 255.255.255.0 secondary

ip address 10.1.144.1 255.255.255.0

duplex auto

speed auto

!

Hope that helps

Roger

Bronze

Re: Multiple Secondary IP for fastethenert port

With the mask you are using (in the original post) these are all on the same subnet.

New Member

Re: Multiple Secondary IP for fastethenert port

Thanks for your response. Yes. I did it and it solve my problem..Thank you once again. Is there a problem having multiple secondary IP's

Bronze

Re: Multiple Secondary IP for fastethenert port

No basically not but there are some routing protocols

which do not work properly with secondary IP's.

I always try to avoid it if is's possible.

Regards

Roger

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