question about opening a port

DISCUSSION Peter Horst 2 participants 2 messages Jul 31, 2006 – Aug 4, 2006

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Peter Horst

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2006-07-31 19:19 UTC #0 lore raw

Hello - if someone has a second, I could really use some help. I'm trying to open a port (in addition to the ones already open) in order to allow DNS traffic (port 53), both UDP and TCP. Does the following iptables script look right for this purpose?

Thanks very much.

Chain RH-Firewall-1-INPUT (2 references)

num  target     prot opt source               destination
1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
2    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           icmp type 255
3    ACCEPT     esp  --  0.0.0.0/0            0.0.0.0/0
4    ACCEPT     ah   --  0.0.0.0/0            0.0.0.0/0
5    ACCEPT     udp  --  0.0.0.0/0            224.0.0.251         udp dpt:5353
6    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp dpt:53
7    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:53
8    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp dpt:631
9    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:631
10   ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
11   ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22
12   ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:25
13   ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:80
14   ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:443
15   ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:53
16   ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           state NEW udp dpt:53
17   REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

Martijn Lievaart

2006-08-04 12:44 UTC #1 lore raw

Quoted 5 lines

Hello - if someone has a second, I could really use some help. I'm trying to open a port (in addition to the ones already open) in order to allow DNS traffic (port 53), both UDP and TCP. Does the following iptables script look right for this purpose?

Quoted 7 lines

Thanks very much.

Chain RH-Firewall-1-INPUT (2 references)

num  target     prot opt source               destination
1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
2    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           icmp

type 255

Better post the output of iptables-save, this output has not enough information.