so, school is out and the children are on the loose

    2024-06-10T21:27:24.199750+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 2620:171:c2::49@33322
    2024-06-10T21:27:24.200561+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 167.99.160.10@14871
    2024-06-10T21:27:24.200642+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 34.223.46.240@53392
    2024-06-10T21:27:24.201218+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 167.99.160.10@2011
    2024-06-10T21:27:24.201422+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 81.106.125.151@54192
    2024-06-10T21:27:24.203263+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 34.223.46.240@53398
    2024-06-10T21:27:24.203643+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 139.99.166.37@42942
    2024-06-10T21:27:25.199585+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 3.228.173.229@34084
    2024-06-10T21:27:25.199678+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 76.93.200.106@10371
    2024-06-10T21:27:25.200951+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 2a02:6b8:c04:262:0:433f:1:3@33586
    2024-06-10T21:27:25.201029+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 2600:3c09::f03c:93ff:fea9:4de0@54166
    2024-06-10T21:27:25.201207+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 118.99.2.29@33170
    2024-06-10T21:27:25.201385+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 213.187.92.252@40559
    2024-06-10T21:27:26.200340+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 2a02:6b8:c04:262:0:433f:1:3@33594
    2024-06-10T21:27:26.200529+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 40.79.144.82@59683
    2024-06-10T21:27:26.203837+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 103.85.93.93@60578
    2024-06-10T21:27:26.205102+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 13.244.33.51@33812
    2024-06-10T21:27:27.208589+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 18.139.204.179@46824
    2024-06-10T21:27:27.210062+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 20.125.201.35@63627
    2024-06-10T21:27:27.331742+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 172.217.37.144@64719
    2024-06-10T21:27:27.332050+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 191.233.201.73@61718
    2024-06-10T21:27:27.391797+00:00 rip knotd[1389]: notice: TCP, terminated 
inactive client, address 81.106.125.151@50624

like tens of thousands.  some children are like that.

so, we take this as an opportunity to learn a bit more about knot tuning

we shortened `tcp-idle-timeout: 2`
we set `tcp-max-clients: 20`

rate limiting seems unlikely to improve things as it is many sources, a
DDos

what else are we missing?

btw, it also whacked knot enough that it failed a resign cycle and we had
to add `unsafe-operation: no-check-keyset` to get back to signing.

clues appreciated.  this can't be the only neighborhood with children.

randy
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