Port Forwarding Troubles

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gusennan
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Joined: 30 Jan 2018
Posts: 1
PostPosted: Sat Feb 03, 2018 14:57    Post subject: Port Forwarding Troubles Reply with quote
I am attempting to forward ssh traffic from the internet to a Linux machine connected by an ethernet cable to my router, but I am missing something in the port forwarding and each connection attempt times out. I configured the port forwarding in the GUI interface. I've gone through this guide's troubleshooting steps, minus the hard reset.

- The test loopback (nc -vz <WAN-IP> 60322) timed-out.
- The port test (nc -vz 192.168.1.101 22) is successful and I am able to connect via SSH to the Linux machine from the LAN.
- The Linux machine does not have a firewall installed.

The troubleshooting guide says to post the iptables output for troubleshooting. Here it is (I replaced the WAN-IP with <WAN-IP>:

Code:

root@dd-wrt:~# iptables -t nat -vnL PREROUTING
Chain PREROUTING (policy ACCEPT 2563 packets, 192K bytes)
 pkts bytes target     prot opt in     out     source               destination         
    1    32 DNAT       icmp --  *      *       0.0.0.0/0            <WAN-IP>        to:192.168.1.1
    1    60 DNAT       tcp  --  *      *       0.0.0.0/0            <WAN-IP>        tcp dpt:60322 to:192.168.1.101:22
    0     0 DNAT       udp  --  *      *       0.0.0.0/0            <WAN-IP>        udp dpt:60322 to:192.168.1.101:22
  400 38851 TRIGGER    0    --  *      *       0.0.0.0/0            <WAN-IP>        TRIGGER type:dnat match:0 relate:0

root@dd-wrt:~# iptables -vnL FORWARD
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
 3950  308K ACCEPT     0    --  *      *       0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
    0     0 ACCEPT     47   --  *      eth0    192.168.1.0/24       0.0.0.0/0           
    0     0 ACCEPT     tcp  --  *      eth0    192.168.1.0/24       0.0.0.0/0           tcp dpt:1723
  604 33276 lan2wan    0    --  *      *       0.0.0.0/0            0.0.0.0/0           
    7   420 ACCEPT     0    --  br0    br0     0.0.0.0/0            0.0.0.0/0           
    0     0 ACCEPT     udp  --  eth0   *       0.0.0.0/0            224.0.0.0/4         
    0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            192.168.1.101       tcp dpt:22
    0     0 ACCEPT     udp  --  *      *       0.0.0.0/0            192.168.1.101       udp dpt:22
    0     0 TRIGGER    0    --  eth0   br0     0.0.0.0/0            0.0.0.0/0           TRIGGER type:in match:0 relate:0
  597 32856 trigger_out  0    --  br0    *       0.0.0.0/0            0.0.0.0/0           
  597 32856 ACCEPT     0    --  br0    *       0.0.0.0/0            0.0.0.0/0           state NEW
    0     0 logdrop    0    --  *      *       0.0.0.0/0            0.0.0.0/0           


Anything ideas about what next steps I might want to take to troubleshoot?
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Router Model: Linksys WRT1900ACv2
Firmware Version: DD-WRT v3.0-r34578 std (01/19/1Cool
Kernel Version: Linux 4.9.77 #94 SMP PREEMPT Fri Jan 19 01:10:01 CET 2018 armv7l
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egc
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Joined: 18 Mar 2014
Posts: 12885
Location: Netherlands
PostPosted: Sat Feb 03, 2018 15:46    Post subject: Reply with quote
Have a look in the build thread. I think port forwarding and NAT loopback are broken. There is a new build, maybe it is resolved in that.
I am curently testing 34780 (Kong's build)
Port range forwarding seems to work, you could try Port Range Forwarding
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Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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