How do I configure Draytek router for LAN

whitland
whitland used Ask the Experts™
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Draytek 2800 router failed (no internet access) and during testing by Draytek tech support I was advised to backup the config and then upgrade the firmware. Having done that, the router still would not connect to the internet and so I have had to replace it with a new Draytek 2820n. I can now connect to the internet when the new router is connected, for testing and setup, to my laptop.The router's default gateway is 192.168.1.1. I then tried restoring the config to the old router so that I could find out what the original LAN settings were. This failed and after lengthy emailing with Draytek it was obvious that the backup file is corrupted so the settings are not retrievable.

The LAN is based on a sophisticated 3COM switch/hub and the pc's have ip addresses commencing 192.168.0.n with a default gateway of 192.168.0.254. The pc's all receive their ip's automatically from the switch (I assume). When I connected the new router to the LAN I could not connect to the internet from any of the networked pc's. I assume that is because the Draytek has a different ip.  I do not want to mess around with the LAN ip's but would greatly appreciate advice on changing the Draytek 2820's settings so that it will allow all pc's on the LAN to connect to the internet and still with each other.
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If you configure the Draytek router's LAN side for an address in the 192.16.0.0 range and then put a default route in the 3com pointing to it you should be all set. Just turn off DHCP on the router if it is enabled and let the PCs continue to get their addresses from the current DHCP server.

Author

Commented:
Thank you for reply but I do not want to change ANY settings in the 3Com because I cannot risk scuppering the LAN. You say to configure the Draytek or an address in the 192.16.0.0. Do you mean 192.168.0.0? Drayteks tend to be far more complex than the cheaper routers to setup. Are you able to point me to the actual fields to complete for this 2820 model and what to alter/add please?  I have attached a .bmp of what I assume is the correct page.
ScreenShot007.bmp
That looks like the right place. Just set it to something like 192.168.0.253 (assuming nothing else has that address and it is excluded form the DHCP scope) since the 3Com is at 192.168.0.254 already. And on the right side of that screen disable the DHCP server because you already have one working.
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Author

Commented:
Thanks Rick O Shay
Will try this out when I go on site on Monday and will let you know the outcome.




Author

Commented:
Thanks Rick...all now working.
Success is always good news.

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