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Daniel Barlow 2025-03-31 23:22:04 +01:00
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THOUGHTS.txt
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@ -7378,3 +7378,72 @@ for each service
set tree = new tree
wait for changes
next iteration
Fri Mar 28 23:25:49 GMT 2025
the ppp connection doesn't come back after a&a reset the lns, this has
happened twice now. Possibly-relevant log entries:
2025-03-27 01:10:20.189135502 rotuer dhcp6c.prefix.dhcp6c.wan.link.pppoe.int.link.a.192.168.8.1 Executed "ip address change 2001:8b0:de3a:40de::1/64 dev int valid_lft 5682 preferred_lft 5682", exit code true
2025-03-27 01:10:20.189182063 rotuer dhcp6c.addr.dhcp6c.wan.link.pppoe.wan.link.pppoe Executed "ip address change 2001:8b0:1111:1111:0:ffff:d9a9:14de/128 dev ppp0 valid_lft 5682 preferred_lft 2082", exit code true
# am assuming these are just normal updates from remote dhcp6
2025-03-27 01:11:19.179528428 rotuer wan.link.pppoe rcvd [LCP TermReq id=0x0]
2025-03-27 01:11:19.179542189 rotuer wan.link.pppoe LCP terminated by peer
2025-03-27 01:11:19.179545869 rotuer wan.link.pppoe Connect time 54273.0 minutes.
2025-03-27 01:11:19.179550109 rotuer wan.link.pppoe Sent 3022278191 bytes, received 2202783935 bytes.
2025-03-27 01:11:19.183056872 rotuer wan.link.pppoe sent [LCP TermAck id=0x0]
# ppp died
2025-03-27 01:11:19.183071352 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: carrier => 0 event on
2025-03-27 01:11:19.183076072 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Failed to send RS (Network unreachable)
2025-03-27 01:11:19.183081592 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Starting RELEASE transaction (timeout 4294967295s, max rc 5)
2025-03-27 01:11:19.183086312 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Send RELEASE message (elapsed 0ms, rc 0)
2025-03-27 01:11:19.183091992 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Failed to send RELEASE message to ff02::1:2 (Network unreachable)
2025-03-27 01:11:19.183096392 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: (re)starting transaction on ppp0
# dhcp6c noticed no ppp so tried to release address. it can't because
# ppp is down. how did it know it was time to say byebye?
2025-03-27 01:11:19.198178337 rotuer int.link.a.192.168.8.1.dnsmasq dnsmasq-dhcp[631]: router advertisement on 2001:8b0:de3a:40de::, old prefix for int
2025-03-27 01:11:19.199068668 rotuer dhcp6c.prefix.dhcp6c.wan.link.pppoe.int.link.a.192.168.8.1 Executed "ip address del 2001:8b0:de3a:40de::1/64 dev int", exit code true
# our prefix delegation is no longer ours
2025-03-27 01:11:19.199381632 rotuer dhcp6c.addr.dhcp6c.wan.link.pppoe.wan.link.pppoe ip: RTNETLINK answers: Address not available
2025-03-27 01:11:19.199401552 rotuer dhcp6c.addr.dhcp6c.wan.link.pppoe.wan.link.pppoe /nix/store/anz85qjb2qw084f5xhpx4qndp260xr9i-lua-tty-aarch64-unknown-linux-musl/bin/lua: ...ch64-unknown-linux-musl-0.1/share/lua/5.3/anoia/init.lua:93: Error executing "ip address del 2001:8b0:1111:1111:0:ffff:d9a9:14de/128 dev ppp0" (exit)
this is the ip6 address that ppp negotiated. is this command failing because
it was removed already?
[....]
2025-03-27 01:11:25.545493523 rotuer wan.link.pppoe Script /nix/store/9n2314z07z1g9dd3sqr0kndinjv0vma3-ip6-up started (pid 10346)
2025-03-27 01:11:25.551376155 rotuer wan.link.pppoe Script /nix/store/9n2314z07z1g9dd3sqr0kndinjv0vma3-ip6-up finished (pid 10346), status = 0x0
2025-03-27 01:11:25.552949055 rotuer wan.link.pppoe sh: write error: Broken pipe
2025-03-27 01:11:25.553494501 rotuer wan.link.pppoe Script /nix/store/jkvnjhiqjahydmns33z5lni1hf9sl3x8-ip-up finished (pid 10345), status = 0x1
2025-03-27 01:11:26.596566491 rotuer wlan0.link.hostapd wlan0: STA-OPMODE-SMPS-MODE-CHANGED 96:75:33:6c:6b:86 static
2025-03-27 01:11:26.656620107 rotuer wlan0.link.hostapd wlan0: STA-OPMODE-SMPS-MODE-CHANGED 96:75:33:6c:6b:86 off
2025-03-27 01:11:27.189590642 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Failed to send RS (Network unreachable)
it's supposed to send only one notification (each up-script only sends
if an output the other has created is there).
~~maybe we're not wiping the outputs when it terminates?~~ checked, we are.
2025-03-27 01:11:27.279458704 rotuer int.link.a.192.168.8.1.dnsmasq dnsmasq-dhcp[631]: no address range available for DHCPv6 request via int
2025-03-27 01:11:27.557594914 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Failed to send SOLICIT message to ff02::1:2 (Network unreachable)
2025-03-27 01:11:31.193583256 rotuer dhcp6c.wan.link.pppoe odhcp6c[615]: Failed to send RS (Network unreachable)
Hypothesis
1) when the remote end bounces ppp, s6 restarts the ppp process
but this doesn't cause dependent services to notice, so odhcpc,
which is bound to the interface, doesn't see that we now have a
new interface but with the same name as the old one
and/or
2) there is a race between acquire-*.fnl starting and the
prefix/address outptus being updated so that we miss the first
value change.