IPtables - port routing, beginner question

Hi,

I'm distributing Java app to SuSe 7.2
I have one problem, I need to receive UDP packets on port 67 (bootp) on
Windows that's OK but on Linux I can't bind to the port <1024.
Is there a way to route packets from port 67 to some port > 1024 using linux
IPtables or some other way, I tried several combinations with no success.

iptables -t nat -A PREROUTING -i 10.254.254.1 -p udp --dport 67 -j
REDIRECT --to-port 6700
iptables -t nat -A OUTPUT -p udp -d 10.254.254.1 --dport 67 -j
REDIRECT --to 6700

With tcpdump (tcpdump udp port 67) I can see that packets are coming to the
port 67, but nothing to the port 6700.

Thanx

"uk" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) om...

> Is there a way to route packets from port 67 to some port > 1024 using
linux
> IPtables or some other way, I tried several combinations with no success.
>
> iptables -t nat -A PREROUTING -i 10.254.254.1 -p udp --dport 67 -j
> REDIRECT --to-port 6700
> iptables -t nat -A OUTPUT -p udp -d 10.254.254.1 --dport 67 -j
> REDIRECT --to 6700

Hi

Try the following instead of REDIRECT --to-port

-j DNAT --to

Cheers
Tim

uk wrote:

> Hi,
>
> I'm distributing Java app to SuSe 7.2
> I have one problem, I need to receive UDP packets on port 67 (bootp) on
> Windows that's OK but on Linux I can't bind to the port <1024.
> Is there a way to route packets from port 67 to some port > 1024 using
> linux IPtables or some other way, I tried several combinations with no
> success.
>
> iptables -t nat -A PREROUTING -i 10.254.254.1 -p udp --dport 67 -j
> REDIRECT --to-port 6700
> iptables -t nat -A OUTPUT -p udp -d 10.254.254.1 --dport 67 -j
> REDIRECT --to 6700

Try this one:
iptables -t nat -A PREROUTING -d 10.254.254.1 -p udp --dport 67 -j
REDIRECT --to-port 6700

Sniff on lo interface if you want to see redirected packets in tcpdump.

--
Greets
adeon