Issue in dhclient -x option
"Rathnakar, Dilip" <[email protected]> Mon, 13 May 2024 10:15:20 +0000
| Newsgroups | gmane.network.dhcp.isc.dhcp-client |
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Hi,
As per dhclient (isc-dhclient-4.4.1) man-page, the "dhclient -x" option sho=
uld do the following:
"Stop the running DHCP client without releasing the current lease. Kills ex=
isting dhclient process as previously recorded in the PID file. When shutdo=
wn via this method dhclient-script will be executed with the specific reaso=
n for calling the script set."
However, this is not working as expected. It is sending a DHCP release pack=
et during exit.
Steps to reproduce the behaviour:
1. Start dhclient using: "dhclient -d -q -cf /var/db/dhclient-eth0.conf -l=
f /var/db/dhclient-eth0.leases -pf /var/db/dhclient-eth0.pid eth0"
2. Ensure dhclient process is running and IP address is acquired.
3. Stop dhclient using: "dhclient -x -pf /var/db/dhclient-eth0.pid -lf /var=
/db/dhclient-eth0.leases eth0"
4. Observe release packet in wireshark.
**Expected behavior**
Should stop running of DHCP client without releasing the current lease. (No=
Release packet should be sent)
**Actual behavior***
Release packet sent.
**Environment:**
- ISC DHCP version: isc-dhclient-4.4.1
- OS: Ubuntu 16.04
Is this a known issue or is there a workaround for this?
Any inputs would be appreciated.
Thanks,
Dilip
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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal">As per dhclient (isc-dhclient-4.4.1) man-page, the &=
quot;dhclient -x" option should do the following:
<o:p></o:p></p>
<p class=3D"MsoNormal">"Stop the running DHCP client without releasing=
the current lease. Kills existing dhclient process as previously recorded =
in the PID file. When shutdown via this method dhclient-script will be exec=
uted with the specific reason for calling
the script set."<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">However, this is not working as expected. It is send=
ing a DHCP release packet during exit.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Steps to reproduce the behaviour:<o:p></o:p></p>
<p class=3D"MsoNormal">1. Start dhclient using: "dhclient -d -q =
-cf /var/db/dhclient-eth0.conf -lf /var/db/dhclient-eth0.leases -pf /var/db=
/dhclient-eth0.pid eth0"<o:p></o:p></p>
<p class=3D"MsoNormal">2. Ensure dhclient process is running and IP address=
is acquired.<o:p></o:p></p>
<p class=3D"MsoNormal">3. Stop dhclient using: "dhclient -x -pf /var/d=
b/dhclient-eth0.pid -lf /var/db/dhclient-eth0.leases eth0"<o:p></o:p><=
/p>
<p class=3D"MsoNormal">4. Observe release packet in wireshark.<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">**Expected behavior**<o:p></o:p></p>
<p class=3D"MsoNormal">Should stop running of DHCP client without releasing=
the current lease. (No Release packet should be sent)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">**Actual behavior***<o:p></o:p></p>
<p class=3D"MsoNormal">Release packet sent. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal"><span lang=3D"FR">**Environment:**<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"FR">- ISC DHCP version: isc-dhclient-4=
.4.1 <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"> </span>- OS: Ubuntu 16.04<o:=
p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Is this a known issue or is there a workaround for t=
his?<o:p></o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Any inputs would be appreciated=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dilip<o:p></o:p></span></p>
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