OpenSUSE Network :: When Disable Firewall / Delayed Messages Can Again Be Sent

Sep 14, 2011

I have been running Senmail on SuSE 11.1 for the last few years with no problems.Since installing SuSE 11.3 a few months ago I have been having problems getting Sendmail to send to some (only a few) servers.If I disable the firewall # SuSEFirewall2 stop.I can send successfully using # sendmail -v -q, or # sendmail -v -qIxxxxx.When I re-enable the firewall I will start to get the timeouts/temporarily unavailable messages again (but as mentioned above, only for some servers) even though I can successfully telnet these servers when the firewall is on. When I disable the firewall the delayed messages can again be sent.Has anybody any ideas what I need to change (presumably in the Firewall) to get things working correctly? 'SMTP with sendmail' is already selected under 'Services to Allow' under YaST Firewall->Allowed Services..

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I suspect this is an initial configuration bug. All firewall logs seem to be going to all
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Apr 7, 2011

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How can I block internetaccess for all other programmes on openSUSE?

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May 25, 2011

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Jun 24, 2010

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OpenSUSE Network :: 11.2 Acting As Router Firewall

Mar 29, 2010

switched recently to 11.2 and it works fine for me as workstation I want to set up a router separating a part of the network and also acting as a firewall/proxy... Configured 2 Ethernet Interfaces, checked Ip forwarding in Yast but it does not forward the packets from the "internal" to the "external" network. Hovewer after I set up my router as default for machines on internal network I can ping the external interface but no adress on external network (particularly the one of the default router) !!! From the router I can reach both networks and the net via default gateway on external. Tried to:

a) switch firewall completely off
b) iptables -P FORWARD ACCEPT
c) masquarading internal adresses to the external network

my interfaces configuration looks like:
eth0 Link encap:Ethernet HWaddr 00:13:D4:E3:A2:7B
inet addr:192.168.1.34 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::213:d4ff:fee3:a27b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

[Code].....

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OpenSUSE Network :: 11.2 Users - Check Your Firewall

May 19, 2010

We have reason to ask this of you following some strange firewall behaviour - But don't panic If you use openSUSE 11.2 and you think: Your Firewall should be running You are not sure but think it should be check and report back here.

This is how to check:

Go to Yast > Security and Users > Firewall

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Jul 24, 2010

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OpenSUSE Network :: Blocking SMTP On Firewall?

Aug 19, 2010

Ok here's my setup :

SuSE 10.0 X86 32 acting as my internet gateway and firewall.

eth0 is my internal interface network 192.168.0.0/24 IP 192.168.0.254 dsl0 is my internet connection and is a single ip PtP connection to my ISP.

My internal network is masquaraded onto the external network.

I run an smtp server on my gateway box that I need to be accessable to both the internal and external networks.

However I want to prevent machines on the internal network from establishing connections to external smtp servers, but still alow them to connect to the smtp server on the gateway to send email.

NOTE I do not want to force attempts to connect to [URL] 25 to be re-directed to my internal server I just want to drop or reject the connection.

The firewall up until now has just been configured through YaST, but am not afraid to edit script files if needed

The reason for doing this it to prevent spambots from being able to send through my isp, I keep my own machines clean but sometimes get asked to disinfect machines for other people (family members etc), where I need to connect to the outside world to get updates/virus defs etc, but don't want them spamming from my network.

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OpenSUSE Network :: Firewall Rules For Specific OS?

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Sep 8, 2010

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So if a machine in the private network has an IP of 10.1.0.222 I should be able to ping it using 10.99.0.222 or some other IP. I have never done this before and after reading up on iptables and linux routing I feel more confused than before. Is it possible to add IPs to eth0 (public) and have them mapped to machines on a private network eth1 or eth

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But I can add rules as how to run opensuse firewall rules are permissive only for inbound traffic and so I can not specifically deny an outgoing connection.

Before using fwbuilder is very powerful and configurable but now I'm with suse for convenience but want to know if you can do what I want, if not I will have to use fwbuilder.

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Feb 26, 2011

I am currently facing a problem with rsync (or maybe ssh, I don't know yet). I have daily backups that are done via cron using rsync from my computer (client) to a NAS. And systematically during these backups my computer completely freezes (no remote login possible, nothing), so I have to hard reboot. As you might imagine, I cannot do this every day. In /var/log/messages there is just a line like that :

Feb 26 17:23:53 eggplant rsyslogd: -- MARK --

right before the hang. The rsync worked well before and I don't really know what changed in my system config. In /var/log/rsyncd.log I sometimes (but not every time) I get :

2011/02/26 16:39:19 [13229] rsync error: received SIGINT, SIGTERM, or SIGHUP (code 20) at rsync.c(543) [Receiver=3.0.7]

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OpenSSH_5.4p1, OpenSSL 1.0.0 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *

[code]....

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So now can I do this with yast? Or have I todo this manually without SUSE firewall?

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Sep 27, 2010

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OpenSUSE Network :: Configuring Squid Firewall In SUSE?

Dec 3, 2010

.i need to configure squid in my company how to install and configure squid in my SUSE server...

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Jan 15, 2011

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Jan 15, 2011

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OpenSUSE Network :: Calling All 11.3 Firewall And Iptables Experts?

Jul 25, 2011

I am in the process of enabling Samba client and server on my opensuse 11.3 32-bit workstation, and have just looked at the firewall rules (via iptables -L) prior to enabling these applications.I have used iptables a lot before and despite having my network interface defined as being in the External Zone (ie the least trusted, and therefore supposedly the most protected), the first rules in iptables are as follows:

INPUT
target=ACCEPT, prot=all, source=anywhere, dest=anywhere
OUTPUT

[code]....

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