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- From: bob@MorningStar.Com (Bob Sutterfield)
- Subject: Re: TCP 1.2 routing
- In-Reply-To: stevea@i88.isc.com's message of Tue, 26 Jan 1993 23: 59:15 GMT
- Message-ID: <BOB.93Jan27184135@volitans.MorningStar.Com>
- Sender: news@MorningStar.Com
- Nntp-Posting-Host: volitans.morningstar.com
- Organization: Morning Star Technologies
- References: <1993Jan26.235915.6378@i88.isc.com> <1k4d6oINN4ph@mudos.ann-arbor.mi.us>
- Date: Wed, 27 Jan 1993 23:41:41 GMT
- Lines: 127
-
- (We were working to resolve this issue quietly in calm, pleasant,
- private discussions with SCO's tech support and developer relations
- folks. But since Mr. Berry's question in these forums seems to be
- getting generally misunderstood, and since our fair name was getting
- dragged into the fray, I felt the need to clarify what's happening.
- To any SCO folks who may be listening in, please accept my apology for
- dragging this out even longer in public.)
-
- In article <1993Jan26.235915.6378@i88.isc.com> stevea@i88.isc.com (Steve Alexander) writes:
- In article <1993Jan26.165229.12678@ennews.eas.asu.edu> berry@enuxha.eas.asu.edu (Joel R. Berry) writes:
- I have recently upgraded to 1.2 TCP/IP from SCO. Much to my
- supprise when I installed ppp and tried to route our networks
- together it failed. Apparently in the new release the routes
- can not route you from one net (or subnet) to another. ...
- According to Morningstar the sco people say that it is a new
- FEATURE!
-
- Surprisingly, MorningStar is a little confused.
-
- (Ummm, I think that's a compliment, right? :-)
-
- You can route, but this behavior is no longer enabled by default,
- in compliance with RFC 1122. When you add a second interface the
- system will ask you if you want to enable gateway functionality.
- Tell it yes.
-
- If you've already done this but answered no, do the following:
- /etc/conf/bin/idtune IPFORWARDING 1
- /etc/conf/bin/idtune IPSENDREDIRECTS 1
-
- He didn't ask how to turn his SCO TCP 1.2 system into a router, though
- this is documented in the installation procedure for Morning Star PPP.
- He wanted to add a route through the destination address of a
- POINTOPOINT link, where the source and destination were not on the
- same IP network or subnet. This worked under SCO TCP 1.1.3, but no
- longer works under SCO TCP 1.2. I'll append an example below.
-
- In article <1k4d6oINN4ph@mudos.ann-arbor.mi.us> mju@mudos.ann-arbor.mi.us (Marc Unangst) writes:
- It's not only a feature -- any system that *does* route packets by
- default is in violation of the Host Requirements RFC.
-
- Right, but he didn't ask how to enable his system to route packets.
- He asked how to enable it to route packets through the destination of
- a POINTOPOINT link where the destination address is on a different IP
- (sub)network than the source address.
-
- At any rate, SCO does support routing/gatewaying packets, but it
- needs to be explicitly turned on.
-
- Right.
-
- I've never used Morningstar PPP, so it may not ask this question.
- If it doesn't (and if it doesn't, you should complain to
- Morningstar, since this is arguably a bug),
-
- Our installation procedure doesn't use netconfig, because (as I
- recall) netconfig couldn't be persuaded to be flexible enough to
- understand what we were trying to tell it to do.
-
- ...then you'll have to manually edit /etc/conf/pack.d/ip/space.c
- and change the lines that read
- #define IPFORWARDING 0
- #define IPSENDREDIRECTS 0
- to
- #define IPFORWARDING 1
- #define IPSENDREDIRECTS 1
-
- All this is also discussed in our installation README, and Mr. Berry
- (being an unusual user who actually RTFMs :-) had already done it.
-
-
- Here's an example of what most users of dial-up IP services want to do
- with their systems:
-
- /* first, a link to someplace else within our organization */
- # pppd 137.175.19.5:137.175.19.44 netmask 0xffffff00 auto
- #
- /* now, a link to another network */
- # pppd 137.175.88.107:192.5.58.18 auto
- #
- #
- /* everything looks normal */
- # ifconfig du0
- du0: flags=51<UP,POINTOPOINT,RUNNING>
- inet 137.175.19.5 --> 137.175.19.44 netmask ffffff00
- # ifconfig du1
- du1: flags=51<UP,POINTOPOINT,RUNNING>
- inet 137.175.88.107 --> 192.5.58.18 netmask ffff0000
- # netstat -i
- Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Collis
- wdn0 1500 137.175.2 conch 10232 0 5320 54 33
- lo0 2048 loopback localhost 754 0 754 0 0
- du0 1500 137.175.19 137.175.19.5 0 0 0 0 0
- du1 1500 137.175 137.175.88.10 0 0 0 0 0
- # netstat -rn
- Routing tables
- Destination Gateway Flags Refs Use Interface
- 127.0.0.1 127.0.0.1 UH 1 0 lo0
- 192.5.58.18 137.175.88.107 UH 0 0 du1
- 137.175.19.44 137.175.19.5 UH 0 0 du0
- 137.175.2 137.175.2.28 U 6 4364 wdn0
- #
- #
- /* we can add a route through a link that stays within our subnet */
- # route add default 137.175.19.44 1
- add net default: gateway 137.175.19.44 flags 0x3
- # route delete default 137.175.19.44
- delete net default: gateway 137.175.19.44 flags 0x1
- #
- /* but we can't add a route through an IP vendor's connection point */
- # route add default 192.5.58.18 1
- add net default: gateway 192.5.58.18 flags 0x3: Network is unreachable
- #
-
- I can't point my default route through a router that's part of a
- different network. How else am I supposed to connect my network with
- PSInet or AlterNet or BARRnet or any of the others?
-
- A major part of the frustration is that, as Mr. Berry noted, this
- worked fine under SCO TCP 1.1.3, as it does under every other UNIX and
- UNIX-like operating system we've ever encountered. My only solace is
- that, since it's a problem in IP, this afflicts users of SCO's new PPP
- product too, so maybe SCO will fix it for all of us :-)
- --
- Bob Sutterfield, Morning Star Technologies +1 614 451 1883
- 1760 Zollinger Rd, Columbus Ohio USA, 43221 +1 800 558 7827
- bob@MorningStar.Com +1 614 459 5054 (FAX)
-