SuSE Support Database

Title: ISDN: dynamic IP-Numbers

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ISDN: dynamic IP-Numbers

Applies to

SuSE Linux: Versions up to (including) 5.1

Request:

What to do when getting a dynamic IP-number from your Internet Service Provider.

Procedure:

The first question is: Wich IP-number can be set, if these is still not known.

There is always a logical network-connection, even if the ISDN-lines are not connected. So this logical connection does need a IP-number.

It is a good idea to use numbers that are not used in the internet, in particular numbers starting with 192.168. For example you can take 192.168.1.1 for your machine and 192.168.1.2 for the point-to-point partner. The default-gateway must be set to the same address than the point-to-point partner (In this case 192.168.1.2, too)

The default route will be deleted, when connecting to the partner. To set it properly to the right address (and reset it when sutting down the conection), there must be a script /etc/ppp/ip-up (and a link to it named ip-down). Do the following:

cd /etc/ppp
cp /usr/doc/packages/i4l/pppsample/ip-up .
chmod 700 ip-up
ln -s ip-up ip-down

Possible Problems:

When using dynamic IP-addresses a problem can occur while connecting automaticly. You realize that when clicking to a link in your web-browser. The connection is set up, but you do not get the page wanted. Pressing the Reload button then shows the page. The raeson for this behavior are left sockets with the old number that is now wrong. For the same reason an unwanted connect canoccur sometimes.

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See also:

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Keywords: ISDN, DYNAMIC, IPPP, CONNECTION

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Feedback welcome: Send Mail to Klaus.Franken@suse.de (Please give the following subject: SDB-isdn_dynip)

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SDB-isdn_dynip, Copyright SuSE GmbH, Nuremberg, Germany - Version: 10. Nov 1997
Impressum - Last generated: 24. Feb 1999 14:48:47 by maddin with sdb_gen 1.00.0