Are you sure that you are not dropping the packet in another table/chain. Perhaps do something like watch -n 1 iptables -L -n -v so that you can see the packet count when you test to see if the packet rule is being accepted or dropped somewhere. Abdul-Wahid On Thu, 9 Sep 2004 04:10:47 +0200, Tom Fischer <tom.fischer@xxxxxxx> wrote: > Hi, > > i have a problem with DNAT. We have to move some services for a few days > on another machine. So we want do DNAT on incoming Packets. I set > > iptables -A PREROUTING -t nat -s 0/0 -d xxx.xxx.xxx.xxx -p tcp --dport > 9000-j DNAT --to xxx.xxx.xxx.xxx > > Should be enough on this box in my opinion. So i can see the Packet > incoming on the old machine, and i can see the Packet with my Source IP > and the new destination IP, but i think the packet never leaves the old > machine. tcpdump looks like this > > [root@server4 mysql]# tcpdump -n port 9000 > tcpdump: listening on eth0 > 04:02:04.746105 217.232.189.4.65423 > oldmachine.9000: S > 740515023:740515023(0) win 5840 <mss 1452,sackOK,timestamp 66069311 > 0,nop,wscale 7> (DF) [tos 0x70] > 04:02:04.746151 217.232.189.4.65423 > newmachine.70.9000: S > 740515023:740515023(0) win 5840 <mss 1452,sackOK,timestamp 66069311 > 0,nop,wscale 7> (DF) [tos 0x70] > 04:02:07.744772 217.232.189.4.65423 > oldmachine.9000: S > 740515023:740515023(0) win 5840 <mss 1452,sackOK,timestamp 66072311 > 0,nop,wscale 7> (DF) [tos 0x70] > 04:02:07.744806 217.232.189.4.65423 > newmachine.9000: S > 740515023:740515023(0) win 5840 <mss 1452,sackOK,timestamp 66072311 > 0,nop,wscale 7> (DF) [tos 0x70] > > The packet never arivves on the new machine. What am I missing? > > Kernel is 2.4.27, the box seems to be Fedora Core 2 and iptables is > Version 1.2.7a. > > Anybody can help me out? > > Tom > >
