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Old 06-16-2013, 11:55 PM   #1
kenneth_phough
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Registered: Dec 2005
Location: Birmingham, AL
Distribution: CentOS, REHL, Vine Linux
Posts: 67

Rep: Reputation: 3
CentOS 5.8: Cannot NAT Forward for HTTP server...


Hi,

This is an embarrassing question. I can't get HTTP traffic forwarded to my web server behind my CentOS 5.8 firewall. I had this all *working* before I moved into my new place. I confirmed that it is *not* a problem with my cable modem or my new ISP by temporarily making my firewall a web server.

Currently with the rules below, if I try to access my website from an external location (say at work or an internet cafe or my phone) i get 502 bad gateway or timeout.

Below are my nat and filter rules:
Code:
Table: nat
Chain PREROUTING (policy ACCEPT)
num  target     prot opt source               destination         
1    DNAT       tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 to:192.168.1.2:80 

Chain POSTROUTING (policy ACCEPT)
num  target     prot opt source               destination         
1    MASQUERADE  all  --  0.0.0.0/0            0.0.0.0/0           

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination         

Table: filter
Chain INPUT (policy DROP)
num  target     prot opt source               destination         
1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
2    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
3    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
4    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:22 state NEW,ESTABLISHED 

Chain FORWARD (policy DROP)
num  target     prot opt source               destination         
1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
2    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
3    ACCEPT     tcp  --  0.0.0.0/0            192.168.1.2         tcp dpt:80 

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination
Any help on how to make http forwarding work again is much appreciated.
 
Old 06-17-2013, 12:10 AM   #2
kenneth_phough
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Registered: Dec 2005
Location: Birmingham, AL
Distribution: CentOS, REHL, Vine Linux
Posts: 67

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First solution...sleep. next, check iptables of web server. Sorry for posting.
 
  


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