Re: Iptables list

Thanks, but currently I have an embedded linux board (based on openwrt) that
use busybox, and there isn't netstat, neither nmap or lsof command. I guess
i can read /proc/net/tcp or udp, but iptables doesn't show a list of used
ports?

On Fri, Nov 6, 2009 at 1:49 PM, Lisa Kachold <lisakachold@obnosis.com>wrote:

>
>
> On Fri, Nov 6, 2009 at 5:30 AM, Craig White <craigwhite@azapple.com>wrote:
>
>> On Fri, 2009-11-06 at 13:13 +0000, Marco Savo wrote:
>> > Hello,
>> > configuring iptables rules,
>> > how I can find out if one port number I want to use is already in
>> > use?
>> > example:
>> >
>> > $IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol udp
>> > --dport ${UDP_PORT} --destination localhost
>> > $IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol tcp
>> > --dport ${TCP_PORT} --destination localhost
>> > $IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol tcp
>> > --dport ${TCP_HOST_PORT} --destination localhost
>> >

>> > How I can check if these ports (UDP_PORT TCP_PORT TCP_HOST_PORT) are
>> > in use from another application?
>> ----
>> you can use netstat - for example, I might check for port 10000...
>> # netstat -an|grep 10000
>> tcp        0      0 0.0.0.0:10000     0.0.0.0:*     LISTEN
>> udp        0      0 0.0.0.0:10000     0.0.0.0:*

>>
>> Craig
>>
>>
>> You can also use nmap
>
> # nmap localhost
>
> or
>
> # netstat -anpt
>
> to see what is listening on what (depending on your distro - check syntax
>
>
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