Port Forwarding between 2 private lans

[QCVrod]

I've setup a "Hadoop cluster in a briefcase" fronted by a WNDR3800 running Gargoyle 1.8.0.
This wndr3800 is the gateway to the hadoop lan for nodes on 20.20.20.0/24.
Its wan link is connected to yet another private (i.e. non routable) lan. The wan link has IP 192.168.1.210 which (incidentally is hosted by another gargoyle router but on a wdr3600 - but this should be of no consequence to my issue).

In the administration interface I have setup 2 port forwarding rules:

YARN ==> from 8088 to 20.20.20.20:8088
HDFS ==> from 50070 to 20.20.20.20:50070

and saved the config.

Yet when I use a browser to point (from 192.168.1.10) to http://192.168.1.210:8088/ the connection fails (I get nothing). Yet, if I switch the wifi from my laptop from the Gargoyle AP hosting the 192.168.1.0/24 network to the Gargoyle AP hosting the 20.20.20.0/24 network and I point a browser directly to 20.20.20.20:8088 I do get the ResourceManager web app expected.

This does not seem to be a issue with Gargoyle 1.8.0 because I performed a quick test on the Garoyle AP hosting the 192.168.1.0/24 network and port forwarding works (from a mobile phone over LTE I could connect to my test machine on the 192.168.1.0/24 network.

Any idea what could be wrong?

I have a feeling there is something silly I forgot or fail to see...

Any help appreciated.

Thanks,

MT

[nworbnhoj]

Looks right to me! Some guesses ....
a typo on the port forwarding address
or a setting under Firewall - Restrictions, Quotas or Qos