[FS#4189] DHCP server detection in dnsmasq init script is unreliable

[OpenWrt Bugs]

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FS#4189 - DHCP server detection in dnsmasq init script is unreliable
User who did this - Paul Fertser (paulfertser)

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Another idea to consider would be using DHCPINFORM packet instead, like dhcping -i does: https://salsa.debian.org/debian/dhcping/-/blob/debian/master/dhcping.c . However, it mentions that "DHCPINFORM packets can only be used on subnets the server is authoritative for. If the monitoring script runs on a subnet the server isn't authoritative for, it should use the DHCPREQUEST packets." I'd still prefer fast DHCPINFORM test to not having any test at all, and it should cover the majority of usecases reliably I guess.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4189#comment10399

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