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Code Issues Releases Activity

dhclient: rc.conf option to disable ARP resolution

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Introduce a new rc.conf option to not wait for ARP resolution within
dhclient. This is plausible on many modern networks where it is possible
to trust the DHCP server to know whether an IP address is available.

Sponsored by:	Google LLC (GSoC 2024)
Signed-off-by:	Isaac Cilia Attard <icattard@FreeBSD.org>
MFC after:	10 days
Reviwed by:	cperciva, brooks, Tom Hukins, Alexander Ziaee
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1368
This commit is contained in:
Isaac Cilia Attard 2024-07-13 12:07:29 +02:00 committed by Colin Percival
parent 84fce4b67a
commit 503adcdf1d
2 changed files with 5 additions and 0 deletions
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1
libexec/rc/rc.conf
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@ -138,6 +138,7 @@ dhclient_flags="" # Extra flags to pass to dhcp client.
#dhclient_flags_em0="" # Extra dhclient flags for em0 only
background_dhclient="NO" # Start dhcp client in the background.
#background_dhclient_em0="YES" # Start dhcp client on em0 in the background.
dhclient_arpwait="YES" # Wait for ARP resolution
synchronous_dhclient="NO" # Start dhclient directly on configured
# interfaces during startup.
defaultroute_delay="30" # Time to wait for a default route on a DHCP interface.

4
libexec/rc/rc.d/dhclient
View File

@ -48,6 +48,10 @@ dhclient_prestart()
rc_flags="${rc_flags} -b"
fi
dhclient_arpwait=$(get_if_var $ifn dhclient_arpwait_IF $dhclient_arpwait)
if ! checkyesno dhclient_arpwait; then
rc_flags="${rc_flags} -n"
fi
# /var/run/dhclient is not guaranteed to exist,
# e.g. if /var/run is a tmpfs