From: Zouta oxpf (zouta.oxpf@gmail.com)
Date: Thu May 26 2005 - 14:32:32 GMT-3
Thanks BOB for the little nice trick. Could be very crucial and useful
at crunch time.
Really Nice!
ZO
On 5/26/05, Bob Sinclair <bsin@cox.net> wrote:
> Tim,
>
> I like to use the command SHOW IP ALIAS in order to get a short listing of the
> IP addresses on each router.
>
> For example:
>
> R1#sh ip alias
> Address Type IP Address Port
> Interface 192.168.0.100
> Interface 50.50.50.1
> Interface 172.16.8.1
> Interface 172.16.7.1
> Interface 172.16.1.1
> Interface 172.16.101.1
>
> I then past the list into notepad, and do a search-and-replace to get rid of
>
> "Interface "
>
> Results in a nice list of IP addresses I can use for my TCL script.
>
> Just to confirm your explanation, I added the following command to R1:
>
> R1(config)#ip alias 192.168.0.105 23
>
> And I was then able to telnet to the 105 address. Here is the subsequent
> output:
>
> R1#sh ip alias
> Address Type IP Address Port
> Alias 192.168.0.105 23
> Interface 192.168.0.100
> Interface 50.50.50.1
> Interface 172.16.8.1
> Interface 172.16.7.1
> Interface 172.16.1.1
> Interface 172.16.101.1
>
> Thanks!
>
> Bob Sinclair
> CCIE #10427, CCSI 30427, CISSP
> www.netmasterclass.net
>
> ----- Original Message -----
> From: ccie2be
> To: 'Bob Sinclair' ; '22Cent@gmail.com' ; 'Group Study'
> Sent: Thursday, May 26, 2005 8:11 AM
> Subject: RE: ip alias
>
>
> Ray,
>
> I think this command falls into the "Stupid Router Tricks" category.
> However, nothing in the lab blueprints excludes such things so it could be
> there.
>
> That said, here are my notes on it.
>
> Its possible to have a router accept telnet requests to an ip host address
> that doesn't exist on any of the router's interfaces. For example, assume
> that the dns entry for a router is entered with the wrong ip address. If
> you configure ip alias <wrong ip> 23, the router will accept that. (See IE
> lab 4) The wrong ip address should only be wrong in the host portion of the
> address- the subnet should exist on the router. Another possible way to
> achieve the same effect is to use 2ndary addressing on an interface. (See
> IE lab 7)
>
> Bob,
>
> Any chance you could post an example of how to use this command to collect
> addresses for a TCL script? Am I missing something obvious cause I don't
> see how this command would help?
>
> TIA, Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Bob
> Sinclair
> Sent: Wednesday, May 25, 2005 9:25 PM
> To: 22Cent@gmail.com; Group Study
> Subject: Re: ip alias
>
> Not sure of its intended use. I use it to collect IP addresses for my TCL
> scripts. Seems to minimize unnecessary characters. It also displays
> dynamic
> addresses, those configured via static NAT or DHCP.
>
>
> Bob Sinclair
> CCIE #10427, CCSI 30427, CISSP
> www.netmasterclass.net
>
> ----- Original Message -----
> From: 22Cent@gmail.com
> To: Group Study
> Sent: Wednesday, May 25, 2005 9:15 PM
> Subject: ip alias
>
>
> Hi group,
> What is the correct usage of the ip alias command. I was once told it
> can be useful in the lab. Any thoughts?
>
> TIA
> Ray
>
> R1(config)#ip alias ?
> A.B.C.D IP address to alias to a port
>
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