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Code Issues Packages Projects Releases 10 Wiki Activity

fix: dnsmasq dhcp

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Ryan Yin
2024-02-17 13:45:14 +08:00
parent fd4f1f9086
commit 34ca7615b4
2 changed files with 18 additions and 3 deletions
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hosts/idols_aquamarine/README.md
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@@ -13,6 +13,20 @@ NOTE: dae(running on aquamarine) do not provides http/socks5 proxy server, so a
- check dae's log by `sudo journalctl -u dae`
1. DNS & DHCP is provided by `dnsmasq` service, check the configuration of `dnsmasq`.
### DHCP cannot be obtained
1. `ss -tunlp`, check if `dnsmasq` is running and listening on udp port 67.
1. `journalctl -u dnsmasq` to check the log of `dnsmasq`.
1. Request a new IP address by disconnect and reconnect one of your devices' wifi.
1. `nix shell nixpkgs#dhcpdump` and then `sudo dhcpdump -i br-lan`, check if the DHCP request is received by `dnsmasq`.
1. The server listens on UDP port number 67, and the client listens on UDP port number 68.
1. DHCP operations fall into four phases:
1. Server **discovery**: The DHCP client broadcasts a DHCPDISCOVER message on the network subnet using the destination address 255.255.255.255 (limited broadcast) or the specific subnet broadcast address (directed broadcast).
1. IP lease **offer**: When a DHCP server receives a DHCPDISCOVER message from a client, which is an IP address lease request, the DHCP server reserves an IP address for the client and makes a lease offer by sending a DHCPOFFER message to the client.
1. IP lease **request**: In response to the DHCP offer, the client replies with a DHCPREQUEST message, broadcast to the server,[a] requesting the offered address.
1. IP lease **acknowledgement**: When the DHCP server receives the DHCPREQUEST message from the client, it sends a DHCPACK packet to the client, which includes the lease duration and any other configuration information that the client might have requested.
1. So if you see only `DISCOVER` messages, the dhsmasq is not working properly.
## References