[Enhancement] Allow multicast DNS on local interfaces in killswitch mode 2 #247
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Floppy
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It actually only needs UDP on one port: |
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Oct 19, 2020
So that we can still use mDNS hostnames for devices on the local network when the killswitch is enabled. Resolves Rafficer#247.
Floppy
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Jun 26, 2021
So that we can still use mDNS hostnames for devices on the local network when the killswitch is enabled. Resolves ProtonVPN#247.
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Describe the bug
The killswitch iptables config filters out multicast DNS, so hosts aren't accessible via mDNS names on local networks; i.e. I can't ssh to my machine running the VPN by name, only by IP.
Expected behavior
Multicast DNS should be allowed on the default interface as well as local network access.
Possible solution
I think the right solution is to add the mDNS IP
224.0.0.251as a rule the same as the local network specifier athttps://github.com/ProtonVPN/linux-cli/blob/1190545a4293332824b28fe442f95f7be44b65d5/protonvpn_cli/connection.py#L849. I'll have a go and send a PR.
Concerns
I'm not sure what the security implications are of doing this... any thoughts?
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