Date: Fri, 15 Dec 2000 21:13:04 +0100 From: Matthias Heidbrink <mh@cs.tu-berlin.de> To: freebsd-isdn@freebsd.org Subject: Firewall Problem with i4b 0.90.1 / FreeBSD 4.0 - Sample configuration? Message-ID: <20001215211303.C25371@nicky.cs.tu-berlin.de>
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Hi,
I've got problems with getting my i4b working together with a firewall, dynamical
IP addresses and NAT (Network Address Translation, "IP Masquerading").
If this sounds well-known to some of you: I asked for help about it half a year
ago, but was not able to find a solution and gave up that time.
Setup:
- i4b 0.90.1, Teles S016.3 card
- sppp via kernel ppp
- Internet provider with dynamical IP addresses
- The FreeBSD 4.0 "standard" firewall
- FreeBSD natd
- Firewall configuration "simple" from the default "/etc/rc.firewall"
The problem seems to have to do with the combination of dynamical IP addresses and NAT.
OK, probably it's not exactly i4b-specific, but I hope to find someone here who knows how
to handle this problem or has a working sample configuration.
When I start natd in verbose mode and start lynx (Ports 53 and 80 should be allowed),
I get the following error message:
--------
Out [UDP] [UDP] 0.0.0.0:1518 -> 195.88.140.15:53 aliased to
[UDP] 0.0.0.0:1518 -> 195.88.140.15:53
natd: failed to write packet back: Permission denied
-------
When I switch the firewall off leaving NAT running, everything seems to work like
expected.
Does someone of you have a similiar combination working and would send me a working
example setup (rc.firewall, isdnd.rc and the sppp setup schript)?
Ciao, Matthias
--
Matthias Heidbrink E-Mail:
Bundesratufer 12 Matthias_Heidbrink@b.maus.de
10555 Berlin, Germany mh@cs.tu-berlin.de
Tel. +49-30-8536361 Mobil +49-179-3981150
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