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Old 01-15-2004, 05:36 PM   #1
countcobolt
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Registered: Nov 2002
Location: Belgium
Distribution: Slackware
Posts: 25

Rep: Reputation: 15
Firewall setting up via iptables not able to get out


Hi everyone,

I am building on a firewall and seem to have a little problem
when connected to the firewall/Router, I cannot ping to other systems. Neither on the inside nor the outside. I have been trying to figure out what went wrong. I accepted the forward by echo ....
I did a simple drop on all protocols. (INPUT, OUTPUT, FORWARD). When I want to do a ping to a system inside or outside the network I can't. I get sendmgr: operation not permitted.
I have opened up all ports between 1024:65665 and dropped everything below.
When I try to ssh to an internal system I also don't get any connection. Any ideas?
All welcome
thx in advance
Steve
 
Old 01-15-2004, 06:43 PM   #2
g-rod
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Registered: Dec 2003
Location: Long Island, NY USA
Distribution: RedHat, SUSE
Posts: 336

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add
iptables -I OUTPUT -p ICMP -j ACCEPT;

also when trying to troubleshoot problems add to the end of the chain a log entry. You can then tail -f /var/log/messages; to see the packets bing droped.
iptables -A OUTPUT -j LOG --log-prefix "OUTPUT";
iptables -A INPUT -j LOG --log-prefix "INPUT";
iptables -A FORWARD -j LOG --log-prefix "FORWARD";
 
  


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