[afnog] DHCP configuration on cisco router 2600 series

[Mark Tinka]

On Saturday 10 September 2005 14:46, Paul wrote:
> mark,

Hi Paul.

> "flash:c2600-is56i-mz.120-7.bin.bin" cisco 2611
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

From what I can see about your IOS, this is 12.0(7), 
feature set is IP PLUS IPSEC 56.

The only DHCP capability of this IOS is 'DHCP Proxy 
Client'. Essentially, this feature manages a pool of IP 
addresses available to PPP or SLIP dial-in clients 
without a known IP address. You can designate all of the 
router's async interfaces to use DHCP or you can turn 
off DHCP on individual interfaces. You can also assign a 
specific IP address to use on a given interface. 

In short, your present IOS does not have support for a 
DHCP server.

It is clear you will need to upgrade your IOS to one that 
supports a DHCP server. In your current train, 12.0 does 
not have support for your platform, but 12.0T does. 
Usually, I do not recommend running T trains in 
production environments, so the next available version 
is 12.1. However, due to insufficient DRAM on your part, 
you will only be able to afford the IP feature set. IP 
PLUS or IP PLUS IPSEC 56 require at least 40MB of DRAM, 
while you only have 32MB. The latest stable IOS for this 
version is 12.1(27b), which only requires 24MB DRAM and 
8MB Flash, which you've got.

However, if you feel you still need the IP PLUS IPSEC 56 
feature set, then 12.0(5)T1 is the IOS you need to 
upgrade to. It requires 32MB DRAM and 8MB Flash.

Good luck,

Mark.

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