NetBSD Problem Report #46423

From www@NetBSD.org  Mon May  7 14:01:40 2012
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Date: Mon,  7 May 2012 14:01:39 +0000 (UTC)
From: tps@vr-web.de
Reply-To: tps@vr-web.de
To: gnats-bugs@NetBSD.org
Subject: dhcpcd does not send hostname to server, even if requested to do.
X-Send-Pr-Version: www-1.0

>Number:         46423
>Category:       bin
>Synopsis:       dhcpcd does not send hostname to server, even if requested to do.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 07 14:05:00 +0000 2012
>Last-Modified:  Tue May 08 14:45:01 +0000 2012
>Originator:     Thomas Schweikle
>Release:        NetBSD 5.1.2 (GENERIC) #0: Thu Feb 2 12:12:28 UTC 2012
>Organization:
>Environment:
NetBSD arve.fritz.box 5.1.2 NetBSD 5.1.2 (GENERIC) #0: Thu Feb  2 12:12:28 UTC 2012  builds@b7.netbsd.org:/home/builds/ab/netbsd-5-1-2-RELEASE/amd64/201202021012Z-obj/home/builds/ab/netbsd-5-1-2-RELEASE/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
Configured /etc/dhcpcd.conf:

#       $NetBSD: dhcpcd.conf,v 1.1.1.1.8.3 2009/11/23 03:13:28 snj Exp $
#
# A sample configuration for dhcpcd.
# See dhcpcd.conf(5) for details.

# Inform the DHCP server of our hostname for DDNS.
hostname arve
# To share the DHCP lease across OSX and Windows a ClientID is needed.
# Enabling this may get a different lease than the kernel DHCP client.
# Some upstream DHCP servers may also require a ClientID, such as FRITZ!Box.
#clientid

# A list of options to request from the DHCP server.
#option domain_name_servers, domain_name, domain_search, host_name
option domain_name_servers, domain_name, domain_search
option classless_static_routes
# Most distributions have NTP support.
option ntp_servers
# Respect the network MTU.
option interface_mtu
# A ServerID is required by RFC2131.
require dhcp_server_identifier

# A hook script is provided to lookup the hostname if not set by the DHCP
# server, but it should not be run by default.
nohook lookup-hostname

Hostname is not send to dhcp-server, nether with "hostname arve" or with only "hostname" set.
>How-To-Repeat:
Install NetBSD from cd as found on the mirrors. Give your installed machine a name dhcpd accepts and handles to dns. dns will only have the lease, but never the hostname, because in none one the dhcp-requests the hostname the client would like to have associated is sent to the server.
>Fix:
Kick out dhcpcd??

>Release-Note:

>Audit-Trail:

Responsible-Changed-From-To: port-amd64-maintainer->bin-bug-people
Responsible-Changed-By: martin@NetBSD.org
Responsible-Changed-When: Mon, 07 May 2012 19:10:49 +0000
Responsible-Changed-Why:
not amd64 specific


From: Roy Marples <roy@marples.name>
To: <gnats-bugs@netbsd.org>
Cc: 
Subject: Re: bin/46423: dhcpcd does not send hostname to server, even if
 requested to do.
Date: Mon, 07 May 2012 21:19:45 +0100

 dhcpcd-5.1.3 on my amd64 NetBSD-5.1 server works fine
 Here's a tcpdump demonstrating this.

 With "hostname fooey" in /etc/dhcpcd.conf

 uberserver$ sudo tcpdump -i rtk0 -vvv -s 0 port bootps                  


           [0,62/62]
 tcpdump: listening on rtk0, link-type EN10MB (Ethernet), capture size 
 65535 byte
 s
 21:01:04.934412 IP (tos 0x10, ttl 64, id 0, offset 0, flags [DF], proto 
 UDP (17)
 , length 328) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] 
 BOOTP/DHCP,
 Request from 00:e0:4c:e5:0a:fd (oui Unknown), length 300, xid 
 0x6ef352b0, Flags
 [none] (0x0000)
            Client-Ethernet-Address 00:e0:4c:e5:0a:fd (oui Unknown)
            Vendor-rfc1048 Extensions
              Magic Cookie 0x63825363
              DHCP-Message Option 53, length 1: Discover
              Requested-IP Option 50, length 4: 10.73.0.199
              MSZ Option 57, length 2: 1500
              Vendor-Class Option 60, length 12: "dhcpcd 5.1.3"
              Hostname Option 12, length 5: "fooey"
              Parameter-Request Option 55, length 12:
                Subnet-Mask, Static-Route, Default-Gateway, 
 Domain-Name-Server
                Hostname, Domain-Name, BR, NTP
                Lease-Time, RN, RB, Option 119
              END Option 255, length 0
              PAD Option 0, length 0, occurs 11

 With just "hostname" in /etc/dhcpcd.conf

 uberserver$ sudo tcpdump -i rtk0 -vvv -s 0 port bootps
 tcpdump: listening on rtk0, link-type EN10MB (Ethernet), capture size 
 65535 bytes
 21:05:07.654348 IP (tos 0x10, ttl 64, id 0, offset 0, flags [DF], proto 
 UDP (17), length 328) 0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum 
 ok] BOOTP/DHCP, Request from 00:e0:4c:e5:0a:fd (oui Unknown), length 
 300, xid 0xb990a884, Fla
 gs [none] (0x0000)
            Client-Ethernet-Address 00:e0:4c:e5:0a:fd (oui Unknown)
            Vendor-rfc1048 Extensions
              Magic Cookie 0x63825363
              DHCP-Message Option 53, length 1: Discover
              Requested-IP Option 50, length 4: 10.73.0.199
              MSZ Option 57, length 2: 1500
              Vendor-Class Option 60, length 12: "dhcpcd 5.1.3"
              Hostname Option 12, length 10: "uberserver"
              Parameter-Request Option 55, length 12:
                Subnet-Mask, Static-Route, Default-Gateway, 
 Domain-Name-Server
                Hostname, Domain-Name, BR, NTP
                Lease-Time, RN, RB, Option 119
              END Option 255, length 0
              PAD Option 0, length 0, occurs 6


 So the question now becomes why do you think dhcpcd is at fault? Maybe 
 your DHCP server is discarding the information.
 Can you post a tcpdump from your machine showing your DHCP message?

 Thanks

 Roy

From: Thomas Schweikle <tschweikle@googlemail.com>
To: gnats-bugs@NetBSD.org
Cc: 
Subject: Re: bin/46423: dhcpcd does not send hostname to server, even if requested
 to do.
Date: Tue, 08 May 2012 16:41:03 +0200

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 Am 07.05.2012 22:20, schrieb Roy Marples:
 > The following reply was made to PR bin/46423; it has been noted by GNAT=
 S.
 >=20
 > From: Roy Marples <roy@marples.name>
 > To: <gnats-bugs@netbsd.org>
 > Cc:=20
 > Subject: Re: bin/46423: dhcpcd does not send hostname to server, even i=
 f
 >  requested to do.
 > Date: Mon, 07 May 2012 21:19:45 +0100
 >=20
 >  dhcpcd-5.1.3 on my amd64 NetBSD-5.1 server works fine
 >  Here's a tcpdump demonstrating this.
 > =20
 >  With "hostname fooey" in /etc/dhcpcd.conf
 > =20
 >  uberserver$ sudo tcpdump -i rtk0 -vvv -s 0 port bootps                =
  =20

 does not ;-)
 ---
 $ cat /var/lib/misc/dnsmasq.leases
 1336485899 00:0c:29:d1:98:bc 172.19.8.141 * *
 ---

 ---
 15:34:59.562519 IP (tos 0x10, ttl 32, id 0, offset 0, flags [none],
 proto UDP (17), length 328)
     0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP,
 Request from 00:0c:29:d1:98:bc, length 300, xid 0xa616ae26, Flags
 [none] (0x0000)
 	  Client-Ethernet-Address 00:0c:29:d1:98:bc
 	  Vendor-rfc1048 Extensions
 	    Magic Cookie 0x63825363
 	    DHCP-Message Option 53, length 1: Discover
 	    Requested-IP Option 50, length 4: 172.19.8.141
 	    Parameter-Request Option 55, length 7:
 	      Subnet-Mask, BR, Time-Zone, Default-Gateway
 	      Domain-Name, Domain-Name-Server, Hostname
 ---

 Asking for Hostname, even if configured not to.
 Not handling a hostname to the server, even if configured to.

 ---
 	    END Option 255, length 0
 	    PAD Option 0, length 0, occurs 41
 15:34:59.598406 IP (tos 0x0, ttl 64, id 61945, offset 0, flags
 [none], proto UDP (17), length 331)
     172.19.8.1.67 > 172.19.8.141.68: [udp sum ok] BOOTP/DHCP, Reply,
 length 303, xid 0xa616ae26, Flags [none] (0x0000)
 	  Your-IP 172.19.8.141
 	  Server-IP 172.19.8.1
 	  Client-Ethernet-Address 00:0c:29:d1:98:bc
 	  file "boot/grub/i386-pc/core.0"
 	  Vendor-rfc1048 Extensions
 	    Magic Cookie 0x63825363
 	    DHCP-Message Option 53, length 1: Offer
 	    Server-ID Option 54, length 4: 172.19.8.1
 	    Lease-Time Option 51, length 4: 1800
 	    RN Option 58, length 4: 900
 	    RB Option 59, length 4: 1575
 	    Subnet-Mask Option 1, length 4: 255.255.255.0
 	    Domain-Name Option 15, length 9: "fritz.box"
 	    Domain-Name-Server Option 6, length 4: 172.19.8.1
 	    Default-Gateway Option 3, length 4: 172.19.8.2
 	    BR Option 28, length 4: 172.19.8.255
 	    END Option 255, length 0
 ---


 /etc/dhcpcd.conf:
 ---
 #       $NetBSD: dhcpcd.conf,v 1.1.1.1.8.3 2009/11/23 03:13:28 snj Exp $
 #
 # A sample configuration for dhcpcd.
 # See dhcpcd.conf(5) for details.

 # Inform the DHCP server of our hostname for DDNS.
 hostname arve
 # To share the DHCP lease across OSX and Windows a ClientID is needed.
 # Enabling this may get a different lease than the kernel DHCP client.
 # Some upstream DHCP servers may also require a ClientID, such as
 FRITZ!Box.
 #clientid

 # A list of options to request from the DHCP server.
 #option domain_name_servers, domain_name, domain_search, host_name
 option domain_name_servers, domain_name, domain_search
 option classless_static_routes
 # Most distributions have NTP support.
 option ntp_servers
 # Respect the network MTU.
 option interface_mtu
 # A ServerID is required by RFC2131.
 require dhcp_server_identifier

 # A hook script is provided to lookup the hostname if not set by the
 DHCP
 # server, but it should not be run by default.
 nohook lookup-hostname
 ---

 Even if the manual states dhcpcd shall be used, dhclient is started.
 After creating the neccessary configuration file, dhclient now sends
 the hostname. Looks like docs are wrong here: dhclient is default,
 not dhcpcd. Changing to dhcpcd in rc.conf makes the whole thing work
 too.


 --=20
 Thomas


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