On 03/04/2011 09:38 AM, Jason Hsu wrote:
My setup:
Modem -> Firewall/server computer -> Ethernet switch -> Main computer
The firewall/server computer has Shorewall (firewall), DNSMasq, DHCP3 Server,
and SSH.
I'm trying to troubleshoot why I'm unable to connect to my network from another
location by using SSH. But that's not the subject of this post. This problem
is what led me to try stopping the Shorewall firewall.
When I stop the Shorewall firewall, I'm unable to connect to the Internet from
the main computer. However, I'm still able to connect to the Internet from the
firewall/server computer. (I'm able to ping yahoo.com from the firewall/server
computer with 0% packet loss. However, when I try to ping yahoo.com from the
main computer, I get 100% packet loss.)
When I start the Shorewall firewall, the main computer's Internet access is
restored.
What's going on? How can turning OFF a firewall block Internet access? I
thought that the purpose of a firewall is to BLOCK connections, not MAKE
connections.
How are you stoping shorewall ? if you issue a shorewall stop, it goes
in to a lockdown mode. You have to issue a shorewall clear to allow all
traffic.
See : http://www.shorewall.net/starting_and_stopping_shorewall.htm
Mihira.
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