<![CDATA[Tearing my hair out trying to debug newfound packet loss on my home network.]]>Tearing my hair out trying to debug newfound packet loss on my home network. I updated OpnSense the other day through a year of deferred updates. I thought that was the source of the problem. It was not.

To cut to the chase, here's a nice little iperf log. The === 40001 === is the source port that I have iperf configured to send from

# sh checkem-cmu
===== 40001 =====
[ 5] 0.00-5.02 sec 59.8 KBytes 97.4 Kbits/sec 0.547 ms 0/51 (0%) receiver
[ 5] 0.00-5.25 sec 59.8 KBytes 93.2 Kbits/sec 0.824 ms 0/51 (0%) receiver
[ 5] 0.00-5.03 sec 59.8 KBytes 97.4 Kbits/sec 0.686 ms 0/51 (0%) receiver
===== 40002 =====
[ 5] 0.00-5.02 sec 5.86 KBytes 9.56 Kbits/sec 0.340 ms 41/46 (89%) receiver
[ 5] 0.00-5.02 sec 7.03 KBytes 11.5 Kbits/sec 0.326 ms 39/45 (87%) receiver
[ 5] 0.00-5.02 sec 5.86 KBytes 9.56 Kbits/sec 0.141 ms 36/41 (88%) receiver
===== 40003 =====
[ 5] 0.00-5.02 sec 59.8 KBytes 97.5 Kbits/sec 0.635 ms 0/51 (0%) receiver
[ 5] 0.00-5.06 sec 59.8 KBytes 96.7 Kbits/sec 2.689 ms 0/51 (0%) receiver
[ 5] 0.00-5.02 sec 59.8 KBytes 97.5 Kbits/sec 0.839 ms 0/51 (0%) receiver

This is repeatable. Most 5-tuples work. Particular 5-tuples experience 90% packet loss.

So, naturally, I swapped out my router for my laptop, and managed to repeat the packet loss.

So now is the hard part: Convincing Verizon they've got a bad LAG or ECMP group a little bit inside their network when all I can talk to is a front-line tech guy who's very nice but only knows how to test my ONT and has no idea what iperf or ECMP is. 🤣

]]>https://forum.fedi.dk/topic/79ce57df-bc2d-4109-a91b-18502d4abb17/tearing-my-hair-out-trying-to-debug-newfound-packet-loss-on-my-home-network.RSS for NodeMon, 28 Sep 2026 20:05:32 GMTFri, 18 Sep 2026 02:20:55 GMT60<![CDATA[Reply to Tearing my hair out trying to debug newfound packet loss on my home network. on Fri, 18 Sep 2026 14:06:38 GMT]]>@dave_andersen best wishes!

I often recommend nping for things like this

]]>https://forum.fedi.dk/post/https://helvede.net/users/kramse/statuses/117292426724661102https://forum.fedi.dk/post/https://helvede.net/users/kramse/statuses/117292426724661102Fri, 18 Sep 2026 14:06:38 GMT<![CDATA[Reply to Tearing my hair out trying to debug newfound packet loss on my home network. on Fri, 18 Sep 2026 13:52:04 GMT]]>Oh yeah, this is the hard part. Apparently the front-line techs have no way to receive information via any text format. They had to video and take a shot of my screen to see the traceroutes.

blah blah this could have been an email blah blah and instead I've spent 2 hours on the phone with them.

]]>https://forum.fedi.dk/post/https://hachyderm.io/users/dave_andersen/statuses/117292369464041148https://forum.fedi.dk/post/https://hachyderm.io/users/dave_andersen/statuses/117292369464041148Fri, 18 Sep 2026 13:52:04 GMT