[Bug 262183] DHCP on Hotel Wi-Fi: dhclient[2433]: send_packet: No buffer space available

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262183

            Bug ID: 262183
           Summary: DHCP on Hotel Wi-Fi: dhclient[2433]: send_packet: No
                    buffer space available
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: nc@FreeBSD.org

When I attempt to use DHCP on hotel Wi-Fis, I get errors like this:

dhclient[2433]: send_packet: No buffer space available

The nature of the issue is that, while I can connect to the open Wi-Fi just
fine, wpa_supplicant is successful, I am unable to get a DHCP lease.

I cannot get a DHCP lease on both the built-in dhclient and dhcpcd from ports.

This is happening on a HP Spectre x360 14-ea0023dx running 14-CURRENT
9ad210c1593. This happens on the built-in Intel AX201, and both Realtek and
Ralink dongles.

In the past, open hotel Wi-Fi has worked fine on FreeBSD. Also, home Wi-Fi
(WPA2, both Netgear Orbi and Huawei) and my Android phone (both Pixel and
OnePlus) as a hotspot/repeater works fine.

The hotels are in many parts of the US: Portland, Salt Lake City, Austin,
Provo, and small towns, etc, and with many different
managers/brands/franchises.

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