https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237649
John W. O'Brien <j...@saltant.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |j...@saltant.com
--- Comment #10 from John W. O'Brien <j...@saltant.com> ---
I believe I can reproduce this on 12.1-RELEASE in a VNET jail.
>From /etc/jail.conf (host)
====
dhcptest1 {
path = "/usr/jail/dhcptest1";
host.hostname = "dhcptest1.net.isc.upenn.edu";
vnet;
vnet.interface = dhcp1;
allow.raw_sockets;
mount.fdescfs;
devfs_ruleset = 40;
}
====
/etc/devfs.rules (host)
====
[devfsrules_jail_bpf=40]
add include $devfsrules_hide_all
add include $devfsrules_unhide_basic
add include $devfsrules_unhide_login
add path zfs unhide
add path 'bpf*' unhide
own bpf* root:network
perm bpf* 0660
====
/etc/rc.conf (jail)
====
firewall_enable="YES"
firewall_type="open"
ifconfig_dhcp1="DHCP"
====
The relevant lines from /etc/network.subr toward the end of ifconfig_up() are:
====
if dhcpif $1; then
if [ $_cfg -ne 0 ] ; then
${IFCONFIG_CMD} $1 up
fi
if syncdhcpif $1; then
/etc/rc.d/dhclient start $1
fi
_cfg=0
fi
====
This is the only place anywhere in /etc containing "dhclient start", and it
only runs if the iface is set to "SYNCDHCP" or if synchronous_dhclient=YES.
I cannot figure out how this ever worked as documented in the rc.conf manpage,
but I did find a clue in base r157706: "Allow the administrator to specify if
dhclient should be started when /etc/rc.d/netif configures the interface or
only by devd." That suggests to me that devd is a requirement for async DHCP,
but I have not yet found what other configuration is required, nor what might
have changed to trigger a latent bug.
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