Adjusting IPTables to accept requests on port 80 — Anaconda Enterprise 4.4 documentation

Anaconda Enterprise: Documentation

# Adjusting IPTables to accept requests on port 80

Enable clients to access a Repository on standard ports by configuring the server to redirect traffic received on standard HTTP port 80 to the standard Repository HTTP port 8080.

NOTE: These commands assume the default state of IPTables, which is `on` and allowing inbound SSH access on port 22. This is the factory default state for CentOS 6.7. If this default has been changed, you can reset it:

    sudo iptables -L

CAUTION: Mistakes with IPTables rules can render a remote machine inaccessible.

1. Allow inbound access to tcp port 80:

       sudo iptables -I INPUT -i eth0 -p tcp --dport 80 -m comment --comment "# Anaconda Repo #" -j ACCEPT

2. Allow inbound access to tcp port 8080:

       sudo iptables -I INPUT -i eth0 -p tcp --dport 8080 -m comment --comment "# Anaconda Repo #" -j ACCEPT

3. Redirect inbound requests to port 80 to port 8080:

       sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -m comment --comment "# Anaconda Repo #" -j REDIRECT --to-port 8080

4. Display the current IPTables rules:

       iptables -L -n
       Chain INPUT (policy ACCEPT)
       target     prot opt source               destination
       ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:8080 /* # Anaconda Repo # */
       ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 /* # Anaconda Repo # */
       ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
       ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0
       ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
       ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22
       REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

       Chain FORWARD (policy ACCEPT)
       target     prot opt source               destination
       REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

       Chain OUTPUT (policy ACCEPT)
       target     prot opt source               destination

   NOTE: The PREROUTING (nat) IPTables chain is not displayed by default. To display the chain:

       iptables -L -n -t nat
       Chain PREROUTING (policy ACCEPT)
       target     prot opt source               destination
       REDIRECT   tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 /* # Anaconda Repo # */ redir ports 8080

       Chain POSTROUTING (policy ACCEPT)
       target     prot opt source               destination

       Chain OUTPUT (policy ACCEPT)
       target     prot opt source               destination

5. Save the running IPTables configuration to `/etc/sysconfig/iptables`:

       sudo service iptables save