Wireshark mailing list archives

Re: DHCP option 66

From: sigafoose () gmail com
Date: Sun, 20 May 2012 22:03:54 +0000

There are a few test apps that do this also there is a perl script in cpan I believe. Google dhcp test client

Sent via BlackBerry by AT&T

-----Original Message-----
From: "Noam Birnbaum" <noam () maccentricsolutions com>
Sender: wireshark-users-bounces@wireshark.orgDate: Sun, 20 May 2012 14:48:55 
To: Community support list for Wireshark<wireshark-users () wireshark org>
Reply-To: Community support list for Wireshark <wireshark-users () wireshark org>
Cc: Community support list for Wireshark<wireshark-users () wireshark org>
Subject: Re: [Wireshark-users] DHCP option 66

Ahhhhhhhhhh!

Suggestions in how to manually form a DHCP discover that requests option 66? 

Sent from my iPhone

On May 19, 2012, at 3:57 PM, "Bob Carlson" <bob () rjcarlson com> wrote:

In the DHCP Request or Discover messages, there is a list of requested options.
Option 66 must be in that list or it will not be returned.

Cheers, Bob
Eugene, OR - Tucson, AZ

-----Original Message-----
From: wireshark-users-bounces () wireshark org
[mailto:wireshark-users-bounces () wireshark org] On Behalf Of Noam Birnbaum
Sent: Friday, May 18, 2012 16:23
To: wireshark-users () wireshark org
Subject: [Wireshark-users] DHCP option 66

We are trying to configure a client's DHCP server to provide Option 66 (TFTP
server address) as part of its lease acknowledgements.  We've configured and
troubleshooted the DHCP server to do so, but Option 66 simply does not show up
in packet captures of the DHCP transaction.  

We've tried swapping out the client router with a completely different
make/model, thinking perhaps the original router's DHCP server had a bug, but
the new router's DHCP acknowledgements also don't have any trace of Option 66.

Below is a text export of the acknowledgement frame from the new DHCP server to
the client.  Am I looking in the wrong spot for Option 66?


****

No.     Time        Source                Destination           Protocol Length
Info                                                            src port dst
port
   122 6.783709    192.168.29.1          255.255.255.255       DHCP     320
DHCP ACK      - Transaction ID 0x31838ff0                       67       68

Frame 122: 320 bytes on wire (2560 bits), 320 bytes captured (2560 bits)
   Arrival Time: May 18, 2012 15:52:26.966006000 PDT
   Epoch Time: 1337381546.966006000 seconds
   [Time delta from previous captured frame: 0.000295000 seconds]
   [Time delta from previous displayed frame: 0.000295000 seconds]
   [Time since reference or first frame: 6.783709000 seconds]
   Frame Number: 122
   Frame Length: 320 bytes (2560 bits)
   Capture Length: 320 bytes (2560 bits)
   [Frame is marked: False]
   [Frame is ignored: False]
   [Protocols in frame: eth:ip:udp:bootp]
   [Coloring Rule Name: UDP]
   [Coloring Rule String: udp]
Ethernet II, Src: Sonicwal_ae:fb:9c (00:17:c5:ae:fb:9c), Dst: Broadcast
(ff:ff:ff:ff:ff:ff)
   Destination: Broadcast (ff:ff:ff:ff:ff:ff)
       Address: Broadcast (ff:ff:ff:ff:ff:ff)
       .... ...1 .... .... .... .... = IG bit: Group address
(multicast/broadcast)
       .... ..1. .... .... .... .... = LG bit: Locally administered address
(this is NOT the factory default)
   Source: Sonicwal_ae:fb:9c (00:17:c5:ae:fb:9c)
       Address: Sonicwal_ae:fb:9c (00:17:c5:ae:fb:9c)
       .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
       .... ..0. .... .... .... .... = LG bit: Globally unique address (factory
default)
   Type: IP (0x0800)
Internet Protocol Version 4, Src: 192.168.29.1 (192.168.29.1), Dst:
255.255.255.255 (255.255.255.255)
   Version: 4
   Header length: 20 bytes
   Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT
(Not ECN-Capable Transport))
       0000 00.. = Differentiated Services Codepoint: Default (0x00)
       .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable
Transport) (0x00)
   Total Length: 306
   Identification: 0x0000 (0)
   Flags: 0x02 (Don't Fragment)
       0... .... = Reserved bit: Not set
       .1.. .... = Don't fragment: Set
       ..0. .... = More fragments: Not set
   Fragment offset: 0
   Time to live: 32
   Protocol: UDP (17)
   Header checksum: 0x7c12 [validation disabled]
       [Good: False]
       [Bad: False]
   Source: 192.168.29.1 (192.168.29.1)
   Destination: 255.255.255.255 (255.255.255.255) User Datagram Protocol, Src
Port: 67 (67), Dst Port: 68 (68)
   Source port: 67 (67)
   Destination port: 68 (68)
   Length: 286
   Checksum: 0x3f24 [validation disabled]
       [Good Checksum: False]
       [Bad Checksum: False]
Bootstrap Protocol
   Message type: Boot Reply (2)
   Hardware type: Ethernet
   Hardware address length: 6
   Hops: 0
   Transaction ID: 0x31838ff0
   Seconds elapsed: 0
   Bootp flags: 0x0000 (Unicast)
       0... .... .... .... = Broadcast flag: Unicast
       .000 0000 0000 0000 = Reserved flags: 0x0000
   Client IP address: 0.0.0.0 (0.0.0.0)
   Your (client) IP address: 192.168.29.152 (192.168.29.152)
   Next server IP address: 0.0.0.0 (0.0.0.0)
   Relay agent IP address: 0.0.0.0 (0.0.0.0)
   Client MAC address: Apple_8a:b2:e5 (c8:bc:c8:8a:b2:e5)
   Client hardware address padding: 00000000000000000000
   Server host name not given
   Boot file name not given
   Magic cookie: DHCP
   Option: (t=53,l=1) DHCP Message Type = DHCP ACK
       Option: (53) DHCP Message Type
       Length: 1
       Value: 05
   Option: (t=54,l=4) DHCP Server Identifier = 192.168.29.1
       Option: (54) DHCP Server Identifier
       Length: 4
       Value: c0a81d01
   Option: (t=1,l=4) Subnet Mask = 255.255.255.0
       Option: (1) Subnet Mask
       Length: 4
       Value: ffffff00
   Option: (t=51,l=4) IP Address Lease Time = 1 day
       Option: (51) IP Address Lease Time
       Length: 4
       Value: 00015180
   Option: (t=3,l=4) Router = 192.168.29.1
       Option: (3) Router
       Length: 4
       Value: c0a81d01
   Option: (t=6,l=8) Domain Name Server
       Option: (6) Domain Name Server
       Length: 8
       Value: 0808080804020202
       IP Address: 8.8.8.8
       IP Address: 4.2.2.2
   End Option


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Current thread:

DHCP option 66 Noam Birnbaum (May 19)
- Re: DHCP option 66 Bob Carlson (May 19)
  - Re: DHCP option 66 Noam Birnbaum (May 20)
    - Re: DHCP option 66 sigafoose (May 20)
- Re: DHCP option 66 Marco Zuppone (May 20)
- <Possible follow-ups>
- Fw: DHCP option 66 Alex Lindberg (May 19)