this post was submitted on 16 Aug 2023
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No route to host until I ping and then it works fine? (lemmy.nz)
submitted 1 year ago* (last edited 1 year ago) by luthis@lemmy.nz to c/linux@lemmy.ml
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Probably should find a linux networking specific community for this one..

I have a strange issue that feels very familiar, like I've fixed it before, but I can't remember how.

I try to rtsp to security cam:

ffplay rtsp://user:password@192.168.19.137:554/h264Preview_01_main

And I get a no route:

Connection to tcp://192.168.19.137:554?timeout=0 failed: No route to host

rtsp://user:password@192.168.19.137:554/h264Preview_01_main: No route to host

Strange, I'm in the same subnet 192.168.19.129/24, and it worked a few days ago.

Check ping:

ping 192.168.19.137

PING 192.168.19.137 (192.168.19.137) 56(84) bytes of data.

64 bytes from 192.168.19.137: icmp_seq=1 ttl=64 time=5.69 ms

Of course.. So I run the command again;

ffplay rtsp://user:password@192.168.19.137:554/h264Preview_01_main

And now it works.

I could bandaid by crontabbing a ping every hour or something, but I would really like to know why I'm getting a 'no route' until I ping.

My routing table is pretty basic:

default via 192.168.19.1 dev enp4s0 proto dhcp src 192.168.19.129 metric 100

default via 192.168.19.1 dev enp4s0 proto dhcp src 192.168.19.129 metric 1002

172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown

172.18.0.0/16 dev br-68c1e0344e27 proto kernel scope link src 172.18.0.1 linkdown

192.168.19.0/24 dev enp4s0 proto dhcp scope link src 192.168.19.129 metric 1002

192.168.19.1 dev enp4s0 proto dhcp scope link src 192.168.19.129 metric 1024

And I don't think I have any rules in firewall for LAN.

Any ideas?

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[–] luthis@lemmy.nz 7 points 1 year ago (2 children)

I can try test that.

The camera is always accessible via the android app, but that's not quite the same.

[–] empireOfLove@lemmy.one 10 points 1 year ago

The android app, if proprietary and manufacturer specific, could very well be sending its own magic wake-on-lan packet to check if the camera is alive.

I unfortunately don't know enough about nitty-gritty networking stuff to help with the actual routing though, refer to the other commenters for that.

[–] blattrules@lemmy.world 7 points 1 year ago

This is what I thought it sounded like too. I’ve seen similar behavior with wake on lan before.