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Up to 50% packet loss since days, only after gateway.

asked 2018-11-21 16:48:26 +0000

Niato gravatar image

I am experiencing huge packet loss since a few days now and my ISP seems baffled and unable to fix the problem. First I thought it would be a damaged Ethernet cable in my LAN, but I checked the cable and also tested if the packet loss is happening on other OSes and hardware. It is persistent across Linux/Mac/Windows, Ethernet/WiFi and four different PCs.

I spoke twice with the disruption department of my ISP. They measured the connection/wire, found no indices of malfunction on the physical layer, I guess. The router had the strange behavior of losing the connection a few times an hour. Currently my ISP is still investigating, but they don't seem to solve this. So maybe there is something to see from my side.

I did the following to diagnose the problem:

  • Used MTR (Matt's Traceroute) on different IPs/Hosts.
  • Checked all LAN connected devices with MTR and ping. No losses in the LAN, including the gateway router.
  • Pinged the first hop (as reported by traceroute) behind my gateway router. Losses start there.
  • The router itself has a diagnose panel, which displays 0 for the router and the switching centre.
  • There is no cyclic pattern in the bursts of packet loss. At least for my untrained eyes.
  • The connection is unusable in this state. I couldn't even solve the captcha for minutes, because of connection errors.

Matt's TraceRoute Screenshot

Wireshark Capture at Cloudshark

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answered 2018-11-25 19:21:29 +0000

Packets are sent to, but not received by - packets from that IP arrive without a problem. That's all I can say based on this capture. Not sure about the cause, can be a bunch of things. Definitely something for the ISP to look into.

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answered 2018-11-21 17:52:46 +0000

Jaap gravatar image

If your ISP is Versatel Deutschland, and your IP address is, swap out the router. It' weird to see a TTL exceeded on your router.

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No, my IP at that point in time was 88.130.64.x. is the first hop.

Niato gravatar imageNiato ( 2018-11-21 20:11:29 +0000 )edit

Then you should show your ISP, there seems to be a route issue somewhere.

Jaap gravatar imageJaap ( 2018-11-22 07:15:01 +0000 )edit

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Asked: 2018-11-21 16:48:26 +0000

Seen: 321 times

Last updated: Nov 25 '18