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Access Server from Wifi, not from Lan?

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slvrscoobie

Regular Contributor
so i just upgraded my server from a 115j to a 214play.
in doing so I left all the ports for the applications the same. However, I am unable to access the server via the external DDNS setting from my internal LAN.
But my same computer / browser CAN access the server from the external DDNS name from the same router if I use Wifi.
I tried changing a couple of settings on my Fios Modem and Asus router, but I cant seem to make it work. I would use the hosts file, but its a work laptop and I travel a bit so I cant direct it to a static IP.
When it doesnt connect it will usually say 'Waiting for server' and never time out so Im not sure what the deal is.
I can use the SAME computer on the LAN and connect to the VPN via the external address though. I can also use the lan to access my IP cameras. So I think the port forwarding is working, and am wondering if its a synology issue as I had to reinstall everything when migrating from 1 bay to 2 bay.
 
never mind... Sheeeeesh. After about 12 hours of looking at NAT loopbacks and port forwarding settings, i brought the second laptop up, plugged it into the lan, and it works.
Ok - so whats different......
Jumbo Frame.
Enabled on the NAS, enabled on the laptop, except it wasnt working passing through the DDNS i guess...?
Oh well, works again
 
never mind... Sheeeeesh. After about 12 hours of looking at NAT loopbacks and port forwarding settings, i brought the second laptop up, plugged it into the lan, and it works.
Ok - so whats different......
Jumbo Frame.
Enabled on the NAS, enabled on the laptop, except it wasnt working passing through the DDNS i guess...?
Oh well, works again

Jumbo frames probably won't work on the public internet. I think once the packets get past your modem they're smaller sizes. Probably a 1500MTU or smaller. And jumbo frames are just a maximum... if the other device doesn't support Jumbos then your system should fall back to an acceptable MTU and just move along.

http://www.networkworld.com/article/2224722/cisco-subnet/jumbo-frames.html
 
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