Linux 2.2.12, firewall rules (masquerading) and netmask changes

Deimert, Daniel (Daniel.Deimert@Intermec.com)
Tue, 19 Oct 1999 18:45:18 +0200

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Linux 2.2.12 seems to be confused when you have masquerading enabled =
and
change the netmask on one of the interfaces.

I had netmask 255.255.255.0 on the eth0,
masquerading was enabled and working from 192.168/16 on eth0 to eth1

Then I reconfigured eth0 to netmask 255.255.254.0, and suddenly =
masquerading
no longer worked. No new connections were possible.

This behaviour was unexpected and I couldn't find it documented =
anywhere.

> ---
> Daniel Deimert (daniel.deimert@intermec.com)
> Network Engineer @ Intermec Printers AB, M=F6lndal, Sweden
>=20
>=20
>=20
>=20
>=20

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
Linux 2.2.12, firewall rules (masquerading) and netmask = changes

Linux 2.2.12 seems to be confused when = you have masquerading enabled and change the netmask on one of the = interfaces.

I had netmask 255.255.255.0 on the = eth0,
masquerading was enabled and working = from 192.168/16 on eth0 to eth1

Then I reconfigured eth0 to netmask = 255.255.254.0, and suddenly masquerading no longer worked. No new = connections were possible.

This behaviour was unexpected and I = couldn't find it documented anywhere.

---
Daniel Deimert = (daniel.deimert@intermec.com)
Network = Engineer @ Intermec Printers AB, M=F6lndal, Sweden





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