topic Re: Intermittent packet drops on split-tunnel VPN client sessions in Broadband

Intermittent packet drops on split-tunnel VPN client sessions

crustyg — Fri, 10 Jun 2022 14:19:03 GMT

Hi: long-time WFH network+systems monitoring specialist, using multiple concurrent RDP+SSH sessions. Have had occasional, intermittent RDP session freezes (and reconnection), but since TT upgraded firmware in Sagemcom FAST 5364 to SG4K10002829t have experienced frequent RDP freezes - usually after resuming usage of a session - almost as though a device in the chain has quietly dropped the session, so next few packets go nowhere. Have attempted to prove this with simultaneous Wireshark sessions at each end - but can't see evidence of new TLS session and RDP uses UDP. Almost every RDP session (on 2 different machines) does this now after a few mins of not being used - exasperating and a major productivity hamper.

However, continuous ICMP Ping from my machine to RDP and google.co.uk *has* shown 3-4 dropped packets to RDP but *not* to google, suggesting that the VPN session is being hampered.

When TT firmware first upgraded, TT did acknowledge some VPN clients had been affected by f/w upgrade: wondering if this issue is still there? Typically running 6-8RDP sessions + 2-5SSH sessions at once, as well as non-tunnelled mail/web/StackOverflow (!) web sessions.

Any ideas? Seen this elsewhere? Thanks.

Re: Intermittent packet drops on split-tunnel VPN client sessions

Divsec — Fri, 10 Jun 2022 18:22:02 GMT

Hi @crustyg I'm sure the team can resolve this for you, unfortunately it's Friday and they won't be back till Monday. Your post has been escalated.

Re: Intermittent packet drops on split-tunnel VPN client sessions

Debbie-TalkTalk — Mon, 13 Jun 2022 06:31:38 GMT

Hi crustyg

I can see that your router firmware has been changed to a different version. Are you still experiencing this issue?

Thanks

Debbie

Re: Intermittent packet drops on split-tunnel VPN client sessions

crustyg — Mon, 13 Jun 2022 06:46:48 GMT

Hi Debbie: it actually seems much worse *since* the firmware was upgraded - the 'new' firmware completely broke my switch/router, then you offered this f/w which re-enabled packets to flow, but the intermittent pauses/disconnections have worsened. It's almost as though keep-alives are being dropped.

Re: Intermittent packet drops on split-tunnel VPN client sessions

Debbie-TalkTalk — Mon, 13 Jun 2022 06:49:13 GMT

Hi crustyg

Would you like me to send a replacement router for testing?

Re: Intermittent packet drops on split-tunnel VPN client sessions

crustyg — Mon, 13 Jun 2022 07:11:26 GMT

Not yet, please. I have an alternate testing strategy about to go into effect. If that doesn't work, then I'll ask , thanks

Re: Intermittent packet drops on split-tunnel VPN client sessions

Debbie-TalkTalk — Mon, 13 Jun 2022 07:12:19 GMT

Hi crustyg

Ok, please let us know how you get on.

Thanks

Debbie

Re: Intermittent packet drops on split-tunnel VPN client sessions

Debbie-TalkTalk — Fri, 17 Jun 2022 12:33:21 GMT

Hi crustyg

How are you getting on?

Debbie

Re: Intermittent packet drops on split-tunnel VPN client sessions

crustyg — Fri, 17 Jun 2022 13:14:31 GMT

Hi: the problem persists (although not quite as bad), and I'm using different connectivity. My focus has shifted to hunting for some pesky network enhancement driver that Dell or MS have installed which interferes. It's not my TT edge device.

Thanks for the follow up.

Re: Intermittent packet drops on split-tunnel VPN client sessions

Debbie-TalkTalk — Fri, 17 Jun 2022 13:19:52 GMT

Hi crustyg

Thanks for your reply.

If there is anything else we can do then please let us know.