As with you all, I am experiencing user complaints about VPN connectivity and reliabilty.
One thing I have found today with one of the GP users is using what I'll call ISP C. Our company has two ISP's I'll call them ISP A and ISP B. A traceroute from either side shows traffic going to the client traversing over ISP A from the GP Gateway to reach ISP C. However, a traceroute from ISP C reveals it is traversing a path over ISP B to reach the VPN Gateway. I'm not sure if that has something to do with it or not just yet. It has been at least for this user, a problem more recently with things starting in September.
To add to it, I had a conversation with another engineer in the area at a reseller. He mentioned that he is having an issue at a client site with VPN users dropping randomly as well. They are using Cisco AnyConnect but the interresting thing is they share the same ISP C that our client is using. Not only that, but it is something that started occuring in the same timeframe as our client. These clients should have only one AS hop between their AS and our AS. I haven't confirmed the other path.
So, don't discount the idea that problems could just be ISP related. If anyone has any comments on asynchronous ISP paths using BGP please reply. I'd enjoy hearing them.
Absolutely, I find that 9.5 times out of 10 the issue is related to a wonky ISP connection, but its hard to get the user to believe that. They repeatedly come back to be,even when I have logs saying its not the VPN client, to get me to fix it for them. Frequently I advise them to contact their ISP, some do some don't, those who have contacted the ISP got resolution those who didn't got noe resolution. :)
In my most recent case, the user finally contacted the ISP.
Their VPN client was dropping every hour. ISP had them reboot their cable modem/router combo and it has been fine ever since.
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