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- Xref: sparky comp.protocols.tcp-ip:6122 comp.protocols.tcp-ip.domains:911
- Path: sparky!uunet!ferkel.ucsb.edu!ucsbcsl!spectrum.CMC.COM!lars
- From: lars@spectrum.CMC.COM (Lars Poulsen)
- Newsgroups: comp.protocols.tcp-ip,comp.protocols.tcp-ip.domains
- Subject: Re: Multiple class 'C' addresses versus single class 'B'
- Keywords: addresses
- Message-ID: <1993Jan26.073042.9185@spectrum.CMC.COM>
- Date: 26 Jan 93 07:30:42 GMT
- References: <1993Jan23.002517.22830@nosc.mil>
- Organization: CMC Network Systems (Rockwell DCD), Santa Barbara, CA, USA
- Lines: 48
-
- In article <1993Jan23.002517.22830@nosc.mil>
- kent@humu.nosc.mil (Kent K. Kuriyama) writes:
- >We intend to have approximately 2000 IP addresses with typically 50
- >address per sub-net. Using class 'C' address we are looking at 40 sub-
- >nets or approximately 10 'C' addresses.
-
- Right now is a really bad time to have to make this kind of decision.
- Today, it will be really painful to run with the C's; next year most
- routers will probably start to know how to do this.
-
- >Questions:
- >
- >1) What kind of management problems will we run into if we use class
- >'C' vice 'B'? It seems to me that use of multiple class 'C' addresses
- >would not change the number of routers required - the number of sub-nets
- >dictates that.
-
- Mostly yes.
-
- >2) Someone mentioned that linking up a bunch of 'C' addresses will
- >require the use of some external gateway protocol (make sense - we need
- >to route between class 'C' networks) on our routers. Is this a big
- >deal? Is EGP a feature only available on expensive routers?
-
- Currently, the only routing protocol that understands subnet masks is
- OSPF. New versions under development by router vendors extends this
- capability to
- RIP version 2
- BGP version 4
-
- >3) Are there any advantages to getting a contiguous set of class 'c'
- >addresses (e.g. 192.101.190,191,192, . . . etc)?
-
- If you get the multiple C's, be sure to get a block that's aligned on a
- power of 2; eg 192.208.16.0 - 192.208.31.255. When the newer protocols
- are in place, this will allow your network to only take up one route
- entry in the backbone.
- >
- >4) Would there be any problem in implementing a single domain name
- >DNS over multiple class 'C' addresses?
-
- No problem.
-
-
- --
- / Lars Poulsen, SMTS Software Engineer Internet E-mail: lars@CMC.COM
- CMC Network Products / Rockwell Int'l Telephone: +1-805-968-4262
- Santa Barbara, CA 93117-3083 TeleFAX: +1-805-968-8256
-