opening port

[maidei]

Just install ubuntu sever 8.04.
-how to reverse this command or delete it

iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT ??

i thought I was suppose open port 80 on ubuntu server 8.04, used the above command,
Since I notice that I didnt need to use the command.
Only need to install apache.

So can I reverse this command. If I leave it the way it is, will that be safe

Regards

Maidei




root@maidgal:/home/maidgal2# iptables -v -n -L
Chain INPUT (policy ACCEPT 14108 packets, 678K bytes)
pkts bytes target prot opt in out source destination

8 392 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0
tcp dpt:80
1 44 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0
tcp dpt:80

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination


Chain OUTPUT (policy ACCEPT 14017 packets, 595K bytes)
pkts bytes target prot opt in out source destination

root@maidgal:/home/maidgal2# sudo iptables -nL
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

[BaseRunner]

Hello,

if you add --line-numbers to your query you get the no.s of all existing rules. You can then use -D <queue> <no> to remove specific rules.
Example:
# iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
# iptables -nL --line-numbers
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80

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

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

# iptables -D INPUT 1
# iptables -nL --line-numbers
Chain INPUT (policy ACCEPT)
num target prot opt source destination

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

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

Cheers
batta