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- From: kmedcalf@io.org (Keith Medcalf)
- Newsgroups: comp.os.os2.networking.tcp-ip
- Subject: Re: Routing with SLIP & Ethernet
- Date: 11 Oct 1994 13:17:50 GMT
- Organization: Keith Medcalf and Associates
- Lines: 86
- Distribution: world
- Message-ID: <37e39u$4hh@ionews.io.org>
- References: <36ioic$t4u@geraldo.cc.utexas.edu> <2e965dde.45585452454d45@extreme.mayn.sub.de>
- Reply-To: kmedcalf@io.org (Keith Medcalf)
- NNTP-Posting-Host: zealot.net2.io.org
- X-Newsreader: IBM NewsReader/2 v1.02
-
- In <2e965dde.45585452454d45@extreme.mayn.sub.de>, pilgrim@extreme.mayn.sub.de (Bjoern "Pilgrim" Karlowsky) writes:
- >Hi Kevin!
- >: ************************* *************************
- >: * 128.97.97.10 (lan0)*===============* 128.97.97.30 (lan0)*
- >: * * ethernet * *
- >: * 128.23.35.20 (sl0) * * *
- >: ************************* *************************
- >: ||
- >: ||
- >: || SLIP
- >: ||
- >: ||
- >: *************************
- >: * 128.23.35.250 *
- >: * *
- >: * *
- >: *************************
- >
- >: The current routing table for PC #1 is
- >: 128.97.97.0 128.97.97.10 lan0
- >: default 128.83.35.250 sl0
- >
- >: The current routing table for PC #2 is
- >: 128.97.97.0 128.97.97.30 lan0
- >
- >
- >: Any help or information is appreciated.
- >
- >: Thanks,
- >: Kevin
- >
- >
- >Kevin Tapperson (kevintap@mail.utexas.edu) wrote:
- >
- >: The ethernet network works fine, and the SLIP connection works fine, however PC
- >: #2 cannot communicate with computers on the other side of the SLIP connection.
- >: (ie. packets are not being transfered between the ethernet (lan0) and SLIP (sl0)
- >: interfaces)
- >
- >: Is the problem with the routing, if so, how should this be routed.
- >
- >You have to publish an ARP entry onto the lan for the SLIP machine with the
- >hardware adress of the lan0 interface from PC#1.
- >You get the adress with netstat -n there. And do:
- >arp -s <hostname_slip_far> <hardwareadress_lan0_pc1> pub
- >
-
- You have violated rule uno of using SLIP -- you forgot to use a
- separate network or subnetwork for your SLIP network. It works
- exactly as it should work. You must not mix topology types within
- the same subnet. TCP/IP was not designed for such foolish setups.
-
- Alternatively, you can merely run dynamic routing on all the machines
- in the network, that is, detach routed -g -s on EVERY MACHINE ON THE
- NETWORK including making sure that RIP routing is active on all the
- routers in the network.
-
- Then, make sure that the GATEWAYS file on the node that connects to the
- badly formed SLIP node is correct, and that the GATEWAYS file on the
- SLIP node with the defective address is correct. And that the GATEWAYS
- file on the default router for your network accurately reflects the
- remote routers that access the slip nodes. Then all will work as you
- expect.
-
- Isn't Dynamic Routing wonderful? This is precicesely why it was
- invented. Isn't it cool that computers on a network can talk to
- each other and tell them how to route packets from one place to
- another?
-
- You can also make the defective SLIP node arpable by proxy, however then
- you will have to contend with the difficulties created by having
- inaccurate hop counts to the outside world. It may truncate the extents
- of the world a little, but that should not be too much of a problem,
- depending on how far you are from the rest of the internet.
-
- Your proper course of action is to allocate a non-arpable network number
- to use as you slip network. Then run routed on both sides of all slip
- connections.
-
- +--------------------------------------------------------------------+
- | Keith Medcalf | Internet: kmedcalf@io.org |
- | Software Engineer | SnailMail: 275 Broadview Ave #152 |
- | Database and Client/Server | Toronto ON CANADA M4M 3H5 |
- | Application Systems | Telephone: (416) 465-9578 |
- +--------------------------------------------------------------------+
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