E-Lins H685m Series User Manual page 84

3) Check if the WAN IP from sim card (shows in the status page once the router is online) is a public IP or
privacy IP, privacy IP will make DDNS no work.
12.7 Port forwarding
12.7 12.7 12.7 Port Port Port forwarding forwarding forwarding not
Question: I configure the port forwarding feature correctly, but still no work.
Answer: first, please check the port if block by your ISP, because some ISP block some ports for security
reason.
For example, the H685m gets WAN IP 27.38.14.223. And the H685m's web port is 10000. So from the other
network, try to visit http:// 27.38.14.223:10000 if can be okay. If no okay, it means the ISP blocks the 10000
port. Then check with your ISP which ports are open for use. Then re-try the port forwarding feature.
12.8 12.8 Serial Serial DTU DTU
12.8 12.8 Serial Serial DTU DTU point-to-point
Problem: Take two H685m. Both support Serial to cellular gateway feature (DTU feature). Configure one as
client, the other as server. But no work.
Answer:
First, we confirm that the H685m both are online, and the server's IP is public IP that can be ping through from
other networks.
Second, we confirm both H685m's DTU feature (Serial to Cellular Feature) are working. We test an example
as follows,
H685m DTU with vodafone sim as client (in Germany)--- China Telecom as server (In China): working
H685m DTU with vodafone sim as server (in Germany)--- China Telecom as client (In China): working
H685m DTU with vodafone sim as client (in Germany)----H685m DTU with vodafone sim as server (in
Germany) : no working
This indicates the two vodafone sim cards cannot communicates each other. The Vodafone ISP limit the two
internal's sim card's communication.
You have two ways to solve the problem.
1) get another sim card from another ISP to test.
2) ask the Vodafone ISP to unlimit two vadafone sim's communication.
12.9 12.9 DNS DNS manual manual
12.9 12.9 DNS DNS manual manual input
Problem: after fill in the DNS server manually, it indicates "Host name error" after click "Apply" button to save.
Tel: +86 (755) 33231620 E-mail:
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E-Lins Technology Co.,Limited
sales@szelins.com sales@e-lins.com
E-Lins H685m Series Router User Manual
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