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Title: ISDN: extremely slow connections

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ISDN: extremely slow connections

Applicable to
S.u.S.E. version: 4.4.1
Kernel version: 2.0.29
HiSax version: 1.5

Symptom:

A rawip-HDLC connection works normal. But with single sessions (ftp, telnet, ...) the connection gets extremely slow (a ls -l can take up to 15 minutes).

If one starts a second connection (ftp, telnet, ...) one can however work with normal speed.

Cause:

The HiSax driver has problems under certain circumstances with large MTU's (Maximum Transfer Units)

Solution:

Declare on both sides the MTU explicitly (in /etc/rc.config) e.g.:
IFCONFIG_1="192.168.102.1 pointopoint 192.168.230.1 mtu 256"

Hint:

This was, up to now, only observed in veeery slow computers (486, 8MB). Feedback is highly welcome!

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See also:

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Keywords: ISDN, MTU, RAWIP, FTP, THROUGHPUT

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Feedback welcome: Send Mail to kfr@suse.de (Please give the following subject: SDB-isdn_mtu)

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SDB-isdn_mtu, Copyright SuSE GmbH, Nuremberg, Germany - Version: 19. Mar 1997
Impressum - Last generated: 24. Feb 1999 14:49:00 by maddin with sdb_gen 1.00.0