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warn on uselessly low MTU

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JackDoan
2026-07-10 20:52:34 -05:00
parent 86733864fe
commit 459cfc6f83
4 changed files with 246 additions and 7 deletions
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examples/config.yml
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@@ -110,6 +110,15 @@ lighthouse:
#- "1.1.1.1:4242"
#- "1.2.3.4:0" # port will be replaced with the real listening port
# Locally discovered addresses are checked against the MTU of the link they were found on. If the link cannot fit
# a full-size packet from the nebula tun device (`tun.mtu` plus encapsulation overhead, which is larger for relayed
# traffic) without fragmenting, a warning is logged.
# When omit_low_mtu_addrs is true, addresses whose links cannot fit normal nebula traffic are dropped from
# lighthouse reports entirely.
# Addresses that can fit normal nebula traffic but not relayed traffic are always still advertised.
# This does not apply to addresses listed in advertise_addrs.
#omit_low_mtu_addrs: false
# EXPERIMENTAL: This option may change or disappear in the future.
# This setting allows us to "guess" what the remote might be for a host
# while we wait for the lighthouse response.