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Full Discussion: PXE boot port issue
Operating Systems HP-UX PXE boot port issue Post 302118252 by bluepluto on Monday 21st of May 2007 01:09:15 AM
Old 05-21-2007
PXE boot port issue

I want to boot an IA unix box from network, I am sure I set the DHCP and boot server, but it still failed !

It says : Client MAC Address: 00 18 FE 28 91 82 .....-
PXE-E16: Valid PXE offer not received.
Load of Core LAN Gb A failed: Not Found

I use the nettl command to trace the UDP package, it writes:

^^^^^^^^^^^^^^^^^^^^^^Gigabit Ethernet LAN/9000 Networking^^^^^^^^^^^^^^^^^^@#%
Timestamp : Fri Apr 27 EAT 2007 16:57:52.714302
Process ID : [ICS] Subsystem : IGELAN
User ID ( UID ) : -1 Trace Kind : PDU IN TRACE
Device ID : 0 Path ID : -1
Connection ID : 0
Location : 00123
=================================== Ethernet ====================================
Source : 00-18-fe-28-91-82 [I] [ ]
Dest : ff-ff-ff-ff-ff-ff [B] [ ] TRACED LEN: 590
Date : Fri Apr 27 16:57:52.714302 EAT 2007
================================ IP Header (inbound -- [ICS]) ================
Source: (A) Dest:
len: 576 ttl: 16 proto: 17 cksum: 0xf3ee id: 0xb4bf
flags: NONE tos: 0x0 hdrlen: 20 offset: 0x0 optlen: 0
-------------------------------- UDP Header ----------------------------------
sport: 68 --> dport: 4109 data len: 548 chksum: 0x3c04
-------------------------------- BOOTP Request -------------------------------
trans id : 0x13880000 seconds : 159 hops : 0
server IP: NULL client IP: NULL your IP: NULL
gateway IP: NULL h/w type : 1 flags : 32768
client h/w addr : 00-18-fe-28-91-82
server name : NULL
file name : NULL
vendor specific : VM_RFC1048

From the document, I got that the client port is 68, the server port should be 67, I mean the DHCP server listening port, while in the UDP package, it shows 4109.
Thanks !

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DHCPDUMP(1)						      General Commands Manual						       DHCPDUMP(1)

dhcpdump - DHCP packet dumper SYNOPSIS
dhcpdump [-h regular-expression] DESCRIPTION
This command parses the output of tcpdump to display the dhcp-packets for easier checking and debugging. USAGE
tcpdump -lenx -s 1500 port bootps or port bootpc | dhcpdump If you want to filter a specific Client Hardware Address (CHADDR), then you can specifiy it as a regular expressions: tcpdump -lenx -s 1500 port bootps or port bootpc | dhcpdump -h ^00:c0:4f This will display only the packets with Client Hardware Addresses which start with 00:c0:4f. OUTPUT
TIME: 15:45:02.084272 IP: (0:c0:4f:82:ac:7f) > (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: 28f61b03 SECS: 0 FLAGS: 0 CIADDR: YIADDR: SIADDR: GIADDR: CHADDR: 00:c0:4f:82:ac:7f:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 3 (DHCPREQUEST) OPTION: 54 ( 4) Server identifier OPTION: 50 ( 4) Request IP address OPTION: 55 ( 7) Parameter Request List 1 (Subnet mask) 3 (Routers) 58 (T1) 59 (T2) At the option field, the first field is the value of the option, the second one (between brackets) is the length of the option-datafield, the third field is the name of the option, the fourth field is the data of the option. RETURN VALUES
Always 0. NOTES
Privileged access is often needed for tcpdump. BUGS
Not all the parameter options are printed verbose, because of lack of documentation. Not all the options are tested, because of lack of clients/servers with these options. If you have a dump of one of them, please send them to me and I'll incorperate them. THANKS TO
Ralph Droms and Ted Lemons "The DHCP Handbook", ISBN 1-57870-137-6. Peter Apian-Bennewitz <apian@ise.fhg.de> for his Client Hardware Address filtering AUTHOR
Edwin Groothuis, edwin@mavetju.org (http://www.mavetju.org) SEE ALSO
dhcpd(8), tcpdump(1), RFC2132 November 21, 2003 November 21, 2003 DHCPDUMP(1)

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