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Operating Systems Linux Firewall?
# 1  
Old 07-18-2011
Firewall?
Dear All
I have put my windows machine behind my centos firewall server with just one NIC. At now, the windows machine can ping 192.9.9.3 but cannot resolve valid url (like www.google.com). I have set DNS for it as well. Can you please let me know what is the missing step?
Thank you
# 2  
Old 07-18-2011
Are you blocking port 53?
# 3  
Old 07-18-2011
Sorry. How can it be checked out?
# 4  
Old 07-19-2011
Maybe iptables -L can help u, iptables -L -t nat or netstat -lnptu. use canyouseeme.org perhaps your ISP block the port 53.
# 5  
Old 07-19-2011
Please find attached the required log.
log-iptables.txt (7.6 KB) 
# 6  
Old 07-23-2011
It is missing that from your firewall
Code:
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT

Can you give more info about that box? Is it DNS, DHCP, FW for network?
Last edited by pludi; 07-23-2011 at 09:05 PM..
# 7  
Old 07-27-2011
Do you try a "dig 8.8.8.8" ?
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