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- Newsgroups: comp.dcom.sys.cisco
- Path: sparky!uunet!ukma!darwin.sura.net!sgiblab!newsun!joeg
- From: joeg@novell.com (Joe Gervais)
- Subject: Re: Routing with non standard addressing
- Message-ID: <1993Jan27.222725.26045@novell.com>
- Sender: news@novell.com (The Netnews Manager)
- Nntp-Posting-Host: va.sjf.novell.com
- Organization: Novell Inc., San Jose, Califonia
- References: <1993Jan21.160333.901@icl.se>
- Date: Wed, 27 Jan 1993 22:27:25 GMT
- Lines: 61
-
- In article <1993Jan21.160333.901@icl.se> mniku@icl.se (Markku Niku ICL/Swe) writes:
- >Hello you all knowlegdable networkers.
- >We need to set up a simple routed network. We've asked our Cisco gugrus
- >of this configuration, and the answers are just now : 4 = it works, 4 = it
- >doesn't.
- >Could somebody with experience of this give me a hint.
-
- Here's how you can do it. Unfortunately you will have to renumber the hosts
- on your class C. Since you want 20-30 hosts, use a 3 bit subnet mask, giving
- 6 subnets of 30 hosts each, mask 255.255.255.224. You lose the all zeros and
- all ones subnet, which is why you get six and not eight subnets and why
- Tony Li said you cant use a single bit subnet mask.
-
- >We've got a class B (non standard) subnet 147.14.90.0 with 7bit host addr
- >and a class C addr 192.121.128.0 (8bit hostaddr today). These are connected
- >together with two IGS routers. Now we need to get a subnet to another city.
- >As we are not in need to have more than about 20-30 nodes in the C net, we'd
- >like to split it to 7bit host addresses and use for routing to more IGS
- >routers. The way we like to connect it is as followed:
- >
- >
- >network 192.121.128.64 <--- ug, renumbering time
- >netmask 255.255.255.224 (existing)
- >|-----------------------------------------------------------------------|
- > |
- > |
- > |-----------|
- > | IGS |
- > |-----------|
- > Z <-------- leased 64k line
- > |-----------|
- > | IGS |
- > |-----------|
- > | network 147.14.90.0
- > | (existing) netmask 255.255.255.0
- >|-----------------------------------------------------------------------|
- > | secondary network 192.121.128.192
- > | netmask 255.255.255.224
- > |-----------|
- > | IGS |
- > |-----------| <--- NEW
- > Z |
- > |-----------| v
- > | IGS |
- > |-----------|
- > | network 192.121.128.128
- > | netmask 255.255.255.224
- >|-----------------------------------------------------------------------|
- >
- >Routing is to be static or IGRP.
- >Will this work, and if it does/doesn't, why?
-
- The revised diagram will work. You can get away without the secondary address
- if the two leased lines terminated on the same router, i.e. CGS or Cisco 4000
- or larger. You maight also consider looking at RFC1219 for hints on how to
- subnet in the future.
-
-
- Joe Gervais joeg@Novell.Com
- Internetworking Products Division (408) 473-8465
- Novell, Inc.
-