From: Mark Lasarko (mlasarko@co.ba.md.us)
Date: Thu May 26 2005 - 10:18:55 GMT-3
Got it - Thank you!
>>> "Bob Sinclair" <bsin@cox.net> 05/26/05 9:09 AM >>>
Hi Mark,
Not sure why the command does not work, unless it is, as Tim said, that you
must already have an address with the same network applied to an interface.
Do you have an interface 33.33.33.1/2, for example?
In other words, the IP ALIAS can add a host address, but not a network.
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: Mark Lasarko
To: bsin@cox.net ; 22cent@gmail.com ; ccielab@groupstudy.com ;
ccie2be@nyc.rr.com
Sent: Thursday, May 26, 2005 9:01 AM
Subject: Re: ip alias
Greetings Bob,
What am I missing here?
R3(config)#ip alias 33.33.33.33 23
Invalid IP address
???
~M
>>> "Bob Sinclair" <bsin@cox.net> 05/26/05 8:44 AM >>>
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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