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Today's Topics:
1. Re: Weird problem of multiple dhcp processes running in
parallel! (karteek.cha...@wipro.com)
2. Re: Weird problem of multiple dhcp processes running in
parallel! (perl-list)
3. Re: Weird problem of multiple dhcp processes running in
parallel! (karteek.cha...@wipro.com)
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Nov 2016 17:00:29 +0000
From: <karteek.cha...@wipro.com>
To: <dhcp-users@lists.isc.org>
Cc: <dhcp-users@lists.isc.org>
Subject: Re: Weird problem of multiple dhcp processes running in
parallel!
Message-ID:
<kl1pr03mb15735d82f0be1040d41f5d0a84...@kl1pr03mb1573.apcprd03.prod.outlook.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
I've reproduced the issue by restarting the dhcpd service exactly at the same
time from 2 different hosts which had resulted in 2 dhcp processes listening on
eth0 interface.
# ps -ef | grep dhcp
root 1284 1 0 Oct23 ? 02:01:27 /sbin/syslog-ng -a
/var/lib/dhcp/dev/log -a /var/lib/dhcp6/dev/log -a /var/lib/named/dev/log
dhcpd 18976 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf
/etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
/db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 18978 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf
/etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
/db/dhcpd.leases -user dhcpd -group nogroup eth0
root 29484 26297 0 14:02 pts/2 00:00:00 grep dhcp
Is this a bug?
Best Regards,
Karteek
________________________________
From: Karteek Challa (Communications-Telecom Equipment)
Sent: 11 November 2016 04:01
To: dhcp-users@lists.isc.org
Subject: Weird problem of multiple dhcp processes running in parallel!
Hi Friends,
I am facing a weird problem with the multiple dhcp process running in parallel.
My dhcp server was configured to listen on only one eth0 and there used to be
only one process running always.
But because of some inconsistent behaviour in hosts not getting IPs, when
observed the linux machine with the dhcp server installed, I observed 5 dhcp
process running in parallel.
DHCPv4 server running in my linux machine.
dhcpd 1934 1.2 0.2 34844 8744 ? Ss 16:25 4:59
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 19095 1.2 0.2 34972 8756 ? Ss Nov09 26:12
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 19349 1.2 0.2 34840 8728 ? Ss Nov09 26:01
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 20649 1.1 0.2 34840 8728 ? Ss Nov09 24:41
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 21533 1.1 0.2 34840 8736 ? Ss Nov09 24:07
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
May I know in what scenario multiple dhcp processes will be created?
Best Regards,
Karteek
The information contained in this electronic message and any attachments to
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Please notify the sender immediately and destroy all copies of this message and
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------------------------------
Message: 2
Date: Tue, 15 Nov 2016 12:25:11 -0500 (EST)
From: perl-list <perl-l...@network1.net>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Weird problem of multiple dhcp processes running in
parallel!
Message-ID:
<973381754.71645.1479230711490.javamail.zim...@network1.net>
Content-Type: text/plain; charset="utf-8"
it shouldn't be able to do that because port 67 would already be in use... The
kernel should prevent it. But I see you are using chroot and so on that I am
not familiar with and how that would affect things.
> From: "karteek challa" <karteek.cha...@wipro.com>
> To: dhcp-users@lists.isc.org
> Cc: dhcp-users@lists.isc.org
> Sent: Tuesday, November 15, 2016 12:00:29 PM
> Subject: Re: Weird problem of multiple dhcp processes running in parallel!
> Hi,
> I've reproduced the issue by restarting the dhcpd service exactly at the same
> time from 2 different hosts which had resulted in 2 dhcp processes listening
> on
> eth0 interface.
> # ps -ef | grep dhcp
> root 1284 1 0 Oct23 ? 02:01:27 /sbin/syslog-ng -a /var/lib/dhcp/dev/log -a
> /var/lib/dhcp6/dev/log -a /var/lib/named/dev/log
> dhcpd 18976 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf
> /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd
> -group nogroup eth0
> dhcpd 18978 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf
> /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd
> -group nogroup eth0
> root 29484 26297 0 14:02 pts/2 00:00:00 grep dhcp
> Is this a bug?
> Best Regards,
> Karteek
> From: Karteek Challa (Communications-Telecom Equipment)
> Sent: 11 November 2016 04:01
> To: dhcp-users@lists.isc.org
> Subject: Weird problem of multiple dhcp processes running in parallel!
> Hi Friends,
> I am facing a weird problem with the multiple dhcp process running in
> parallel.
> My dhcp server was configured to listen on only one eth0 and th ere used to be
> only one process running always.
> But because of some inconsistent behaviour in hosts not getting IPs, when
> observed the linux machine with the dhcp server installed, I observed 5 dhcp
> process running in parallel.
> DHCPv4 server running in my linux machine.
> dhcpd 1934 1.2 0.2 34844 8744 ? Ss 16:25 4:59 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 19095 1.2 0.2 34972 8756 ? Ss Nov09 26:12 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 19349 1.2 0.2 34840 8728 ? Ss Nov09 26:01 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 20649 1.1 0.2 34840 8728 ? Ss Nov09 24:41 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> dhcpd 21533 1.1 0.2 34840 8736 ? Ss Nov09 24:07 /usr/sbin/dhcpd -4 -cf
> /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
> /db/dhcpd.leases -user dhcpd -group nogroup eth0
> May I know in what scenario multiple dhcp processes will be created?
> Best Regards,
> Karteek
> The information contained in this electronic message and any attachments to
> this
> message are intended for the exclusive use of the addressee(s) and may contain
> proprietary, confidential or privileged information. If you are not the
> intended recipient, you should not disseminate, distribute or copy this
> e-mail.
> Please notify the sender immediately and destroy all copies of this message
> and
> any attachments. WARNING: Computer viruses can be transmitted via email. The
> recipient should check this email and any attachments for the presence of
> viruses. The company accepts no liability for any damage caused by any virus
> transmitted by this email. www.wipro.com
> _______________________________________________
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
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------------------------------
Message: 3
Date: Tue, 15 Nov 2016 18:32:16 +0000
From: <karteek.cha...@wipro.com>
To: <dhcp-users@lists.isc.org>
Subject: Re: Weird problem of multiple dhcp processes running in
parallel!
Message-ID:
<kl1pr03mb157339cb27ba811347e39bb784...@kl1pr03mb1573.apcprd03.prod.outlook.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
Thanks for your reply!
The DHCP daemon is started in a chroot environment for security reasons and is
normal way of doing so.
By doing this, the configuration files will be then copied to the chrooted
directory and so the daemon can find them.
If the DHCP server should ever be compromised by an outside attack, the
attacker will still be behind bars in the chroot jail, which prevents him from
touching the rest of the system.
I found same UDP port number 67 for both dhcpd processes.
# netstat -tulpn | grep dhcpd
udp 0 0 0.0.0.0:67 0.0.0.0:*
18976/dhcpd
udp 0 0 0.0.0.0:67 0.0.0.0:*
18978/dhcpd
udp 0 0 0.0.0.0:57676 0.0.0.0:*
18978/dhcpd
udp 0 0 0.0.0.0:30634 0.0.0.0:*
18976/dhcpd
udp 0 0 :::26560 :::*
18976/dhcpd
udp 0 0 :::34621 :::*
18978/dhcpd
Best Regards,
Karteek
________________________________
From: dhcp-users <dhcp-users-boun...@lists.isc.org> on behalf of perl-list
<perl-l...@network1.net>
Sent: 15 November 2016 22:55:11
To: Users of ISC DHCP
Subject: Re: Weird problem of multiple dhcp processes running in parallel!
** This mail has been sent from an external source **
it shouldn't be able to do that because port 67 would already be in use... The
kernel should prevent it. But I see you are using chroot and so on that I am
not familiar with and how that would affect things.
________________________________
From: "karteek challa" <karteek.cha...@wipro.com>
To: dhcp-users@lists.isc.org
Cc: dhcp-users@lists.isc.org
Sent: Tuesday, November 15, 2016 12:00:29 PM
Subject: Re: Weird problem of multiple dhcp processes running in parallel!
Hi,
I've reproduced the issue by restarting the dhcpd service exactly at the same
time from 2 different hosts which had resulted in 2 dhcp processes listening on
eth0 interface.
# ps -ef | grep dhcp
root 1284 1 0 Oct23 ? 02:01:27 /sbin/syslog-ng -a
/var/lib/dhcp/dev/log -a /var/lib/dhcp6/dev/log -a /var/lib/named/dev/log
dhcpd 18976 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf
/etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
/db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 18978 1 0 14:01 ? 00:00:00 /usr/sbin/dhcpd -4 -cf
/etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot /var/lib/dhcp -lf
/db/dhcpd.leases -user dhcpd -group nogroup eth0
root 29484 26297 0 14:02 pts/2 00:00:00 grep dhcp
Is this a bug?
Best Regards,
Karteek
________________________________
From: Karteek Challa (Communications-Telecom Equipment)
Sent: 11 November 2016 04:01
To: dhcp-users@lists.isc.org
Subject: Weird problem of multiple dhcp processes running in parallel!
Hi Friends,
I am facing a weird problem with the multiple dhcp process running in parallel.
My dhcp server was configured to listen on only one eth0 and there used to be
only one process running always.
But because of some inconsistent behaviour in hosts not getting IPs, when
observed the linux machine with the dhcp server installed, I observed 5 dhcp
process running in parallel.
DHCPv4 server running in my linux machine.
dhcpd 1934 1.2 0.2 34844 8744 ? Ss 16:25 4:59
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 19095 1.2 0.2 34972 8756 ? Ss Nov09 26:12
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 19349 1.2 0.2 34840 8728 ? Ss Nov09 26:01
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 20649 1.1 0.2 34840 8728 ? Ss Nov09 24:41
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
dhcpd 21533 1.1 0.2 34840 8736 ? Ss Nov09 24:07
/usr/sbin/dhcpd -4 -cf /etc/dhcpd.conf -pf /var/run/dhcpd.pid -chroot
/var/lib/dhcp -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
May I know in what scenario multiple dhcp processes will be created?
Best Regards,
Karteek
The information contained in this electronic message and any attachments to
this message are intended for the exclusive use of the addressee(s) and may
contain proprietary, confidential or privileged information. If you are not the
intended recipient, you should not disseminate, distribute or copy this e-mail.
Please notify the sender immediately and destroy all copies of this message and
any attachments. WARNING: Computer viruses can be transmitted via email. The
recipient should check this email and any attachments for the presence of
viruses. The company accepts no liability for any damage caused by any virus
transmitted by this email. www.wipro.com
_______________________________________________
dhcp-users mailing list
dhcp-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/dhcp-users
The information contained in this electronic message and any attachments to
this message are intended for the exclusive use of the addressee(s) and may
contain proprietary, confidential or privileged information. If you are not the
intended recipient, you should not disseminate, distribute or copy this e-mail.
Please notify the sender immediately and destroy all copies of this message and
any attachments. WARNING: Computer viruses can be transmitted via email. The
recipient should check this email and any attachments for the presence of
viruses. The company accepts no liability for any damage caused by any virus
transmitted by this email. www.wipro.com
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