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- Path: newsfeed.internetmci.com!panix!not-for-mail
- From: kenny@panix.com (Kenneth Crudup)
- Newsgroups: comp.dcom.modems
- Subject: Re: Sportster ... rumors true?
- Date: 19 Apr 1996 17:52:12 -0400
- Organization: Scott County Consulting, Boston, MA
- Message-ID: <4l91uc$34j@panix2.panix.com>
- References: <4l0m72$e7c@nrtphba6.bnr.ca>
- NNTP-Posting-Host: panix2.panix.com
-
- In article <4l0m72$e7c@nrtphba6.bnr.ca>, kimmyd@bnr.ca (Kimmy Posey) says:
-
- >I get strange behavior. Connects ok but get losts of lost
- >packets and really sluggish FTP/TELNET performance. The
- >modem AND software are configured for hard flow control.
-
- I also used to get this problem at a client's terminal server 'till I realized
- that *their* end was misconfigured- and not respecting HW flow control. I
- had to issue a couple of commands to set the TS to HWFC before I told it to
- start PPP, and *voila*, no more overruns/lost packets.
-
- If you can connect to your TS in text mode (i.e., login to your TS and
- then from there issue commands like "telnet <host>", "show", etc.) try this:
-
- - enter a terminal emulator program
-
- - set your modem to only generate a 1200 bps carrier (i.e., so you only
- connect at 1200 bps). Sometimes, just settings the speed in your terminal
- emulator to 1200 bps should do it, as many modems will limit the
- carrier speed to remain under the DTE speed.
-
- - manually log in, get into a command state, and do "something" (this is
- TS dependent, so I can't be of much help) to generate a lot of output.
-
- - If your end is *really* set to HW FC, and you get missing/garbage chars,
- then the problem is that the TS' port is set to some high-speed value,
- and trying to push say 57.6 kpbs worth of data down a port that's only
- sending 1.2kbps. Their side's modem is deasserting CTS, but the TS
- isn't responding, and blithely sending the data anyway, so much of it
- gets lost. When running a PPP connection, the TCP and/or IP layers on
- your end realize the checksums are bogus, and requests a re-send. Since
- it might take a few resends to get it right, your thruput crawls.
-
- - If that's the case, go scream bloody murder to your admins.
-
- -Kenny
-
- --
- Kenneth R. Crudup, Unix & OS/2 Software Consultant, Scott County Consulting
- kenny@panix.com CI$: 75032,3044 +1 617 524 5929/4949 Home/Office
- 16 Plainfield St, Boston, MA 02130-3633 +1 617 983 9410 Fax
- OS/2 box: pkenny.tiac.net (when I'm online) Get Warp-ed! OS/2 3.0 is here NOW!
-