Solved

Packet loss between Netgear GS748T and Draytek Vigor 2860

Posted on 2016-10-06
6
37 Views
Last Modified: 2016-10-12
Hello

Hoping someone can point us in the right direction after pulling my hair out for the last 2 days on this one.

We have recently installed 2 Netgear GS748T switches (single link connection between the two) into a client's site (approx 30 users but site wanted all wall ports patching in). Since then they keep getting random disconnects on the internet line, but not all at the same time though.

We ran some ping tests through the network - all pings to anything on the internal network is fine, no drops, even after several hours. However pings to the router itself (and internet) are showing sporadic packet drops (anything from 2-7 drops per 10 minutes).

The Draytek uses 2 VLANs - 1 for data (which is connected to the Netgear switches), and another for the phone system (which also seems to be having issues as a result of this too which lead us to suspect the router may be faulty.

We connected to a spare port on the router on the data vlan and confirmed still having the issue when directly connected. So we swapped out the router and the network cable - still having same issues.

I've tried disabling STP, no change. DOS defense is not enabled on either system, we are using VLANs and all of these are setup correctly, no QoS in use either.

The router is on the latest firmware, the switches are on firmware 6.3.1.11.

At present I'm not sure what else to look at or try - there's obviously something happening between the switch and router but for the life of me can't work out what.

Anyone have any helpful suggestions on this? Anyone come across this before?

Thanks in advance.
0
Comment
Question by:Andy M
  • 3
  • 2
6 Comments
 
LVL 30

Expert Comment

by:pgm554
ID: 41832498
I would look at the duplex settings on the router and the switches and make sure everything is set to auto.
Any manual duplex settings should be avoided at all costs.
0
 
LVL 13

Author Comment

by:Andy M
ID: 41832517
As far as I can tell everything is on auto - switch definitely, I'm not sure if you can change it on the Draytek router.
0
 
LVL 30

Assisted Solution

by:pgm554
pgm554 earned 250 total points
ID: 41832528
0
Give your grad a cloud of their own!

With up to 8TB of storage, give your favorite graduate their own personal cloud to centralize all their photos, videos and music in one safe place. They can save, sync and share all their stuff, and automatic photo backup helps free up space on their smartphone and tablet.

 
LVL 68

Assisted Solution

by:Qlemo
Qlemo earned 250 total points
ID: 41832695
If you loose ping packets for an internal IP sporadically, it is a sure sign for overload of the LAN connection or the device. ICMP packets are more likely to be dismissed on overload because considered as unimportant (better drop a ping than a data packet).

Overload can be the result of sustained attacks from Internet, too many rules to check for traffic in the firewall, too much traffc, and much more.
0
 
LVL 13

Accepted Solution

by:
Andy M earned 0 total points
ID: 41833564
Thanks for the suggestions guys. Turns out it was a loop on the internal network - someone had plugged in another switch into a wall port in a room in the building - once we removed this it all started working again normally. Bit strange that it only affected connections to the router but at least it's sorted.
0
 
LVL 13

Author Closing Comment

by:Andy M
ID: 41839785
Found issue was relating to a network loop in the end. Gave assisted points to others as good suggestions.
0

Featured Post

Scale it in WD Gold

With up to ten times the workload capacity of desktop drives, WD Gold hard drives employ advanced technology to deliver among the best in reliability, capacity, power efficiency and performance.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
For many of us, the  holiday season kindles the natural urge to give back to our friends, family members and communities. While it's easy for friends to notice the impact of such deeds, understanding the contributions of businesses and enterprises i…
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

914 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now