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[slakkr]

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.

[FurryNutz]

Internet Service Provider and Modem Configurations

• What ISP Service do you have? Cable or DSL?
• What ISP Modem Mfr. and model # do you have?
• Is ISP Modem/Service using Dynamic or Static WAN IP addressing?
• What ISP Modem service link speeds UP and Down do you have?
• Check cable between Modem and Router, swap out to be sure. Link> Cat6 is recommended.
• Check ISP MTU requirements, Cable is usually 1500, DSL is around 1492 down to 1472. Call the ISP and ask. Link>Checking MTU Values
• Setup DHCP reserved IP addresses for all devices ON the router. Setup/Networking. This ensures each devices gets its own IP address when turned on and connected, eliminates IP address conflicts and helps in troubleshooting and maintain consistency for applications that need to connect as well as mapped drives.
• Ensure devices are set to auto obtain an IP address. Or you might try using Static IP address on the VPN PC thats out side fo the default DHCP IP address pool and test.

[slakkr]

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.

[FurryNutz]

Can check out the VPN FAQ and see if anything helps there:
 Basic VPN Troubleshooting and Suggestions

Keep us posted...

[slakkr]

Can check out the VPN FAQ and see if anything helps there:
 Basic VPN Troubleshooting and Suggestions

Keep us posted...

Appears to be ok with MTU set to 1500, instead of Auto which I believe was by default.

[FurryNutz]

Good to hear. I'll add this to the VPN troubleshooting info.

Enjoy. 

[slakkr]

Update:  been using my work VPN connection on an off and it wasn't fixed by MTU change. Connection is slow and unstable.

[FurryNutz]

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?

[slakkr]

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.

[FurryNutz]

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.

[slakkr]

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.

[FurryNutz]

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?

[slakkr]

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). 

[FurryNutz]

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?

[slakkr]

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.