D-Link Forums

The Graveyard - Products No Longer Supported => Routers => DIR-880L => Topic started by: slakkr on February 11, 2015, 10:52:11 PM

Title: Unstable VPN connection
Post by: slakkr on February 11, 2015, 10:52:11 PM
880L appears to have an issue with VPN connections. I am using PPTP. It's very random, sometimes it works fine for a  10 minutes other times it stops working after a minute. The VPN connection in Windows shows as still being connected, but Remote Desktop times out. I disconnect that connection and connect again.
Title: Re: Unstable VPN connection
Post by: FurryNutz on February 12, 2015, 07:33:33 AM
Internet Service Provider and Modem Configurations
Title: Re: Unstable VPN connection
Post by: slakkr on February 12, 2015, 08:18:16 PM
Frontier. MTU set to Auto

EDIT: I set MTU to 1500, seems to worked better last night, I only had one disconnect in an hour. We'll see.
Title: Re: Unstable VPN connection
Post by: FurryNutz on February 17, 2015, 07:48:13 AM
Can check out the VPN FAQ and see if anything helps there:
 Basic VPN Troubleshooting and Suggestions (http://forums.dlink.com/index.php?topic=58716.0)

Keep us posted...
Title: Re: Unstable VPN connection
Post by: slakkr on February 18, 2015, 09:11:52 AM
Can check out the VPN FAQ and see if anything helps there:
 Basic VPN Troubleshooting and Suggestions (http://forums.dlink.com/index.php?topic=58716.0)

Keep us posted...

Appears to be ok with MTU set to 1500, instead of Auto which I believe was by default.
Title: Re: Unstable VPN connection (RESOLVED)
Post by: FurryNutz on February 18, 2015, 10:15:58 AM
Good to hear. I'll add this to the VPN troubleshooting info.

Enjoy.  ;)
Title: Re: Unstable VPN connection
Post by: slakkr on March 02, 2015, 10:46:31 PM
Update:  been using my work VPN connection on an off and it wasn't fixed by MTU change. Connection is slow and unstable.
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 03, 2015, 07:08:29 AM
Did you review the troubleshooting info for VPN?

Have you tried putting the PC that your VPNing with in to QoS as the highest priority?
Title: Re: Unstable VPN connection
Post by: slakkr on March 20, 2015, 09:41:52 PM
I tried everything I could think of including resetting router and VPN connection was slow and unreliable. I gave up and bought Netgear R8000. Out of the box with no configurations needed VPN works great.
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 23, 2015, 06:57:12 AM
My 880L is currently online and my roommates VPN works well. Not sure what he uses for VPN. I presume it belongs to his work as I don't have to do any configuration on the router.

I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. We find that phone contact has better immediate results over using email.
Let us know how it goes please.
Title: Re: Unstable VPN connection
Post by: slakkr on March 24, 2015, 12:53:15 PM
Yes, VPN is just a connection to my workplace configured on a pc, I've never really configured anything on the router before specific to VPN, PPTP is the only thing that needs to be enabled on the router. I've used the same VPN connection for the past 8 years and all my previous routers (I go through 1 router a year, mostly Netgear) handled it just fine. I am done troubleshooting with this one, if it's not working as expected it's more cost effective to buy another hardware then spend hours troubleshooting the issue. Considering how long it takes dlink to release firmware for this router to fix other items I am not going to hold my breath for them to fix anything related to VPN even if I am able to prove there is an issue.
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 24, 2015, 01:08:42 PM
Well my VPN client is in use over cable DHCP, I wonder if the issue could be your PPTP connection. When you can, try setting up the router on a DHCP cable connection. Maybe take the router to a friend or families place and see if the problem follows.

What region are you located?
Title: Re: Unstable VPN connection
Post by: slakkr on March 26, 2015, 07:50:42 PM
I figured out the issue. It's related to wireless signal.  880L just has weaker throughput then other routers I have tried (Netgear R8000 & Tp-link C9). 
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 27, 2015, 07:14:21 AM
So does this happen only on wireless? Wired too?

How far away are you from the router when your wireless and using VPN?

What wireless modes and frequency are you using when using VPN?
Happens on both radios?

Title: Re: Unstable VPN connection
Post by: slakkr on March 27, 2015, 11:51:54 AM
About 20 feet, through couple of walls. I didn't try 2.4Ghz because I use it for a different purpose, it was just 5Ghz band. I tried different channels, I think it was 153 that I used last. R7000 handled this range fine, as well as C9, but I am sticking now with R8000, everything just flies on 5Ghz band at this distance.
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 27, 2015, 12:01:06 PM
5Ghz isn't great with building materials in between the router and client. There could be some 5Ghz interferences on the 880L.

I presume that if you tested VPN on wired or 2.4Ghz, it may not exhibit this stability issue. I had the 880 connected last week and part of this week. Had a DIR-868L and Asus EA-66N both bridge to the 880L 5Ghz. Both running thru one wooden all. Signal was good for having building materials however distance was about 15 feet.

Title: Re: Unstable VPN connection
Post by: slakkr on March 30, 2015, 10:49:52 AM
 I tried having one client on 5Ghz band and that worked fine. It seems like 880L couldn't handle all the traffic. QoS helped a bit, but not much. I've never had the need to deal with the bridges or extenders and wanted to rely on one router. In any case I've sold 880L already and sticking with R8000 for now. This is my second attempt to switch from Netgear to Dlink (868L as well) and they just can't seem to provide the same performance and features as Netgear. Dlink needs to up the ante.
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 30, 2015, 10:57:48 AM
Ok. Well Sorry it didn't work out. D-Link seems to do well however there maybe other issues else where that could be introducing problems. If you've noticed two different models not operating as expected, then there could be a common cause that lies else where. There have been some issues with various router models, and features however D-Link has been quick to fix them when reproduced. The 880L for me is working great. Going to get it back in operation after a few other models need testing.

Good luck in your endeavors.  ;)
Title: Re: Unstable VPN connection
Post by: slakkr on March 30, 2015, 01:28:09 PM
880L would be fine if you have a few devices, but in my case I have 15 wireless devices some are streaming HD video (sometimes at the same time) and obviously there is a lot of traffic going on. Extenders are not going help the problem for me, but having extra band helps to balance the traffic.
Title: Re: Unstable VPN connection
Post by: FurryNutz on March 30, 2015, 01:42:10 PM
I recommend for future needs, split up the devices on to a another wireless AP. Having that many on a home router can and will exceed bandwidth limits technically and can cause problems. WiFi can only handle certain amounts of devices per radio then the bandwidth will become saturated and would probably start to exhibit Lag. You have to realize that even though your connecting 15 devices and have 1 connection between the router and device, in addition to this, there are many other connections going on as well, per each device and the apps they maybe using. One browser can have many connections thru the router to one web site, even though it's one application on the one device. This maybe your common factor in this since you state that you tried a different model D-Link router before. You maybe trying to apply too many devices per one router where you may need some additional wireless APs to help spread out the band width. We seen this before with other users having many client devices connected to only one AP or router. They are only designed to handle so many devices.