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- Path: sparky!uunet!sun-barr!ames!data.nas.nasa.gov!mustang.mst6.lanl.gov!ucsbcsl!spectrum.CMC.COM!lars
- From: lars@spectrum.CMC.COM (Lars Poulsen)
- Newsgroups: comp.protocols.tcp-ip
- Subject: Re: TCP/IP Addressing in Large Networks
- Message-ID: <1992Jul30.062242.22466@spectrum.CMC.COM>
- Date: 30 Jul 92 06:22:42 GMT
- References: <1992Jul29.191829.13780@newshost.lanl.gov>
- Organization: CMC Network Systems (Rockwell DCD), Santa Barbara, CA, USA
- Lines: 96
-
- In article <1992Jul29.191829.13780@newshost.lanl.gov>
- smj@beta.lanl.gov (Stephen M. Johnson) writes:
- >I work for a large Department of Energy facility (325 square miles, 23,000
- >people) with a large IP population. ... We have a great
- >deal of trouble maintaining an accurate host database because PCs are easily
- >moved, etc. We are struggling internally with how to manage IP addresses
- >so that we maintain an accurate database and consume minimal people resources
- >doing so.
-
- Our facility is much smaller; about 150 people, 200 nodes. Still enough
- to be a hassle to keep the host maps and name server files current.
-
- We run a promiscuous monitor program for an hour each morning and again
- in the afternoon and evening. This maintains a list of all IP addresses
- and ethernet addresses that have been seen on our backbone. It then
- proceeds to supplement this with information from DNS whenever
- available.
-
- Here is a sample of the database:
-
- # Host Tracker Database hostdata updated 29-Jul-92 19.26 on spectrum
- #
- 02-CF-1F-40-06-40 : 131.143.16.20 :29-Jul-92 19.23 :
- CMCVAX.CMC.COM : VAX-11/750:Unix 4.3BSD:MIS - In Computer Room:Ip:
- 08-00-20-00-77-C0 : 131.143.16.30 :29-Jul-92 19.23 :
- Amos.CMC.COM : Sun-3/280:SunOS 4.1.1:Brian Fanning:LmIp:
- AA-00-04-00-03-04 : 131.143.16.39 :29-Jul-92 19.23 :
- THUMPER.CMC.COM : MicroVAX 3800:VMS:Carol Boyce:Ip:
- 08-00-86-00-08-E7 : 131.143.16.40 :23-Jul-92 16.40 :
- ILP.CMC.COM : Imagen-5320:?:Brian Fanning:Ip:
- 02-CF-1F-50-06-14 : 131.143.16.80 :29-Jul-92 09.49 :
- THUMPER.CMC.COM : MicroVAX 3800:VMS:Carol Boyce:Ip:
- 02-CF-1F-90-51-40 : 131.143.16.200 :29-Jul-92 16.09 :
- CIRRUS.CMC.COM : TranServer:TranServer:M Kunz:IpBtp:
-
- Etheraddress : IPaddress : last-seen :
- DNSname : Hardware : Software : Owner : Flags
-
- Separate files track local hosts (i.e. the ethernet address is real) and
- remote hosts (i.e. they are behind IP routers). The program also logs
- usage statistics and some exceptions:
-
- 29-Jul-92 19.00 My name is spectrum - IP address 131.143.16.1
- Loaded hostdata 216 (0 remote, 216 local) 303 TRIE entries
- Loaded host.mac 297 (3 remote, 294 local) 320 TRIE entries
- Loaded host.rmt 2265 (1971 remote, 294 local) 2343 TRIE entries
- Initializing translation tables, please wait... done
- open(/dev/nit) returned 3, errno=0
- +++19.00 Saw new remote host 128.111.246.4 via gateway HINGE.CMC.COM
- ---19.01 4701 frames 4873920 bytes (40/2558 M/B) 6.59% saturation
- ---19.02 778 frames 144645 bytes (44/3242 M/B) 0.21% saturation
- +++19.05 Saw new remote host 128.2.209.227 via gateway HINGE.CMC.COM
- ---19.11 1483 frames 325784 bytes (45/3284 M/B) 0.46% saturation
- ---19.17 1318 frames 306619 bytes (48/3772 M/B) 0.44% saturation
- ***19.24 Exiting: No new stations seen in 5 minutes
- Total frames: 44344 - Total bytes = 22552620 - Max saturation = 6.59
- B/M-c frames: 1000 - B/M-c bytes = 67696 - Max b/m-c bytes = 3772
- Total hosts 2267 (1973 remote, 294 local) 2352 TRIE entries
- Identified IP 128.2.209.227 name TEZUKA.REST.RI.CMU.EDU
- Major traffic from 128.2.209.227 (null) (21.0%)
- Identified IP 128.93.8.8 name chenas.inria.fr
- Identified IP 128.111.246.4 name IRIS4.metiu.ucsb.edu
- Identified IP 128.117.140.3 name unidata.ucar.edu
- Identified IP 128.174.5.98 name vmd.cso.uiuc.edu
- Major traffic from 129.192.64.25 FENNEL.ACC.COM (17.4%)
- Major traffic from 131.143.16.39 THUMPER.CMC.COM (20.3%)
- Major traffic from 131.143.18.40 TANAFIEL.CMC.COM (9.5%)
- Major traffic from 131.143.23.16 JAMMER.CMC.COM (6.5%)
- Major traffic from 131.143.23.90 bigsky.CMC.COM (26.4%)
- *** 29-Jul-92 19.26 All done!! (Pmon3 rev 1.26)
-
- The log file is reviewed periodically. This provides a good sanity check
- on the network. The cumulative database is used to generate /etc/host
- files as well as forward and reverse DNS zone files, complete with
- HINFO data. When adding new hosts, we generally assign them an IP
- address, plug them in, harvest their MAC address and manually add the
- HINFO fields. We then regenerate the DNS zones, using perl scripsts that
- parse the database.
-
- The remote host file gives us a rough idea of who we exchange mail with;
- it is also good for browsing ... I know there's an FTP server at IBM,
- but I can't remember its name ... when users have questions.
-
- Finally, the timestamp helps us periodically harvest IP addresses that
- have fallen into disuse as labs have been reconfigured.
-
- If I had your size of network, I would expand this with some modules to
- collect the information remotely via RMON devices, and tag each host
- with the ethernet segment number it lives on, rather than a local/remote
- bit. This is of course a monumental task.
-
- their ethernet address
- --
- / Lars Poulsen, SMTS Software Engineer Internet E-mail: lars@CMC.COM
- CMC (Rockwell Digital Systems) Telephone: +1-805-968-4262
- Santa Barbara, CA 93117-5503 TeleFAX: +1-805-968-8256
-