Packets dropping all of a sudden, starting to go mad
NetStar
Newbie ✭
Hi all, I've tried most things so I've come here for assistance.
We have a Sonicwall TZ600. We have a 3rd party application that is not hosted by us. In order to connect to it from our office, we have a site to site VPN setup.
The issue started a few days ago whereby users could no longer access it from the office. They can however access it when they work from home and use the VPN client. We have tried a number of things such as upgrading the firmware on the firewall, rebooting it, rebuilding the VPN with the 3rd party, getting them to also update their equipment and reboot it but nothing.
When I look at the captured packets from a users machine, I get the following:
The above is going from our users machine to the destination and below is the reply:
In the Sonicwall I have enabled these settings;
I have also in the access rules, disabled DPI and allowed TCP urgent packets.
Any assistance would be helpful.
Answers
AFAIK, "cache add cleanup drop the packet" is when the connection was closed but one side or the other keeps talking. The further responses are dropped, because the connection is gone.
Are you monitoring quality of this connection? Is it likely that this is caused by serious jitter?
When you say "use the VPN client" do you mean, the user VPNs to your office then connects across the site-site? Or are they VPNing directly to where this is hosted?