D
David Beaven
Can anyone please explain why the client is not getting a lease using the
dhcp relay agent (hope this is the right forum for this)
Thanks
David
Client discover:
1026 99.687640 00304F1E1134 *BROADCAST DHCP Discover
(xid=74664FA6) 0.0.0.0 255.255.255.255 IP
DHCP: Discover (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 0.0.0.0
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Discover
DHCP: Unrecognized Option = 116 (0x74)
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Host Name = CATS2550
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
DHCP Relay agent listening on 172.16.0.1 forwards to dhcp server
139.184.195.11
1028 99.687640 000BCD4E8CC3 00306E1D9438 DHCP Discover
(xid=74664FA6) 172.16.0.1 139.184.195.11 IP
IP: ID = 0x9711; Proto = UDP; Len: 328
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 328 (0x148)
IP: Identification = 38673 (0x9711)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0xA7BE
IP: Source Address = 172.16.0.1
IP: Destination Address = 139.184.195.11
IP: Data: Number of data bytes remaining = 308 (0x0134)
DHCP: Discover (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 1 (0x1)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Discover
DHCP: Unrecognized Option = 116 (0x74)
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Host Name = CATS2550
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
Offer: client MAC 00:30:4f:1e:11:34 has reservation in dhcp server scope of
172.16.1.1
1029 99.689593 WATCHG040FD6 000BCD4E8CC3 DHCP Offer
(xid=74664FA6) 139.184.195.11 172.16.0.1 IP
IP: ID = 0x19D6; Proto = UDP; Len: 330
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 330 (0x14A)
IP: Identification = 6614 (0x19D6)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 127 (0x7F)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0x25F8
IP: Source Address = 139.184.195.11
IP: Destination Address = 172.16.0.1
IP: Data: Number of data bytes remaining = 310 (0x0136)
DHCP: Offer (xid=74664FA6)
DHCP: Op Code (op) = 2 (0x2)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 0 (0x0)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 172.16.1.1
DHCP: Server IP Address (siaddr) = 139.184.195.11
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Offer
DHCP: Subnet Mask = 255.255.0.0
DHCP: Renewal Time Value (T1) = 6:00:00
DHCP: Rebinding Time Value (T2) = 10:30:00
DHCP: IP Address Lease Time = 12:00:00
DHCP: Server Identifier = 139.184.195.11
DHCP: Domain Name = ids.ac.uk
DHCP: Router = 172.16.0.1
DHCP: Domain Name Server = 139.184.195.11 139.184.194.19
DHCP: End of this option field
Request: client says can I have the offer
1030 99.690570 00304F1E1134 *BROADCAST DHCP Request
(xid=74664FA6) 0.0.0.0 255.255.255.255 IP
IP: ID = 0x1FD; Proto = UDP; Len: 352
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 352 (0x160)
IP: Identification = 509 (0x1FD)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0x3791
IP: Source Address = 0.0.0.0
IP: Destination Address = 255.255.255.255
IP: Data: Number of data bytes remaining = 332 (0x014C)
DHCP: Request (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 0.0.0.0
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Request
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Requested Address = 172.16.1.1
DHCP: Server Identifier = 139.184.195.11
DHCP: Host Name = CATS2550
DHCP: Dynamic DNS updates = (Length: 24) 00 00 00 43 41 54 53 32
35 35 30 2e 61 64 2e 69 ...
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
DHCP relay agent forwards request:
1032 99.690570 000BCD4E8CC3 00306E1D9438 DHCP Request
(xid=74664FA6) 172.16.0.1 139.184.195.11 IP
IP: ID = 0x9714; Proto = UDP; Len: 352
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 352 (0x160)
IP: Identification = 38676 (0x9714)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0xA7A3
IP: Source Address = 172.16.0.1
IP: Destination Address = 139.184.195.11
IP: Data: Number of data bytes remaining = 332 (0x014C)
DHCP: Request (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 1 (0x1)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Request
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Requested Address = 172.16.1.1
DHCP: Server Identifier = 139.184.195.11
DHCP: Host Name = CATS2550
DHCP: Dynamic DNS updates = (Length: 24) 00 00 00 43 41 54 53 32
35 35 30 2e 61 64 2e 69 ...
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
NACK. What is going on!
1033 99.691546 00306E1D9438 *BROADCAST DHCP NACK
(xid=74664FA6) 139.184.195.11 255.255.255.255 IP
IP: ID = 0x19D7; Proto = UDP; Len: 328
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 328 (0x148)
IP: Identification = 6615 (0x19D7)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0xD10A
IP: Source Address = 139.184.195.11
IP: Destination Address = 255.255.255.255
IP: Data: Number of data bytes remaining = 308 (0x0134)
UDP: IP Multicast: Src Port: BOOTP Server, (67); Dst Port: BOOTP Client
(68); Length = 308 (0x134)
UDP: Source Port = BOOTP Server
UDP: Destination Port = BOOTP Client
UDP: Total length = 308 (0x134) bytes
UDP: UDP Checksum = 0x7D89
UDP: Data: Number of data bytes remaining = 300 (0x012C)
DHCP: NACK (xid=74664FA6)
DHCP: Op Code (op) = 2 (0x2)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 0 (0x0)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 0.0.0.0
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP NACK
DHCP: Server Identifier = 139.184.195.11
DHCP: End of this option field
Then an ACK:
1034 99.693499 WATCHG040FD6 000BCD4E8CC3 DHCP ACK
(xid=74664FA6) 139.184.195.11 172.16.0.1 IP
IP: ID = 0x19D8; Proto = UDP; Len: 335
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 335 (0x14F)
IP: Identification = 6616 (0x19D8)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 127 (0x7F)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0x25F1
IP: Source Address = 139.184.195.11
IP: Destination Address = 172.16.0.1
IP: Data: Number of data bytes remaining = 315 (0x013B)
DHCP: ACK (xid=74664FA6)
DHCP: Op Code (op) = 2 (0x2)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 0 (0x0)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 172.16.1.1
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP ACK
DHCP: Renewal Time Value (T1) = 6:00:00
DHCP: Rebinding Time Value (T2) = 10:30:00
DHCP: IP Address Lease Time = 12:00:00
DHCP: Server Identifier = 139.184.195.11
DHCP: Subnet Mask = 255.255.0.0
DHCP: Dynamic DNS updates = (Length: 3) 00 ff 00
DHCP: Domain Name = ids.ac.uk
DHCP: Router = 172.16.0.1
DHCP: Domain Name Server = 139.184.195.11 139.184.194.19
DHCP: End of this option field
dhcp relay agent (hope this is the right forum for this)
Thanks
David
Client discover:
1026 99.687640 00304F1E1134 *BROADCAST DHCP Discover
(xid=74664FA6) 0.0.0.0 255.255.255.255 IP
DHCP: Discover (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 0.0.0.0
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Discover
DHCP: Unrecognized Option = 116 (0x74)
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Host Name = CATS2550
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
DHCP Relay agent listening on 172.16.0.1 forwards to dhcp server
139.184.195.11
1028 99.687640 000BCD4E8CC3 00306E1D9438 DHCP Discover
(xid=74664FA6) 172.16.0.1 139.184.195.11 IP
IP: ID = 0x9711; Proto = UDP; Len: 328
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 328 (0x148)
IP: Identification = 38673 (0x9711)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0xA7BE
IP: Source Address = 172.16.0.1
IP: Destination Address = 139.184.195.11
IP: Data: Number of data bytes remaining = 308 (0x0134)
DHCP: Discover (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 1 (0x1)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Discover
DHCP: Unrecognized Option = 116 (0x74)
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Host Name = CATS2550
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
Offer: client MAC 00:30:4f:1e:11:34 has reservation in dhcp server scope of
172.16.1.1
1029 99.689593 WATCHG040FD6 000BCD4E8CC3 DHCP Offer
(xid=74664FA6) 139.184.195.11 172.16.0.1 IP
IP: ID = 0x19D6; Proto = UDP; Len: 330
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 330 (0x14A)
IP: Identification = 6614 (0x19D6)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 127 (0x7F)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0x25F8
IP: Source Address = 139.184.195.11
IP: Destination Address = 172.16.0.1
IP: Data: Number of data bytes remaining = 310 (0x0136)
DHCP: Offer (xid=74664FA6)
DHCP: Op Code (op) = 2 (0x2)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 0 (0x0)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 172.16.1.1
DHCP: Server IP Address (siaddr) = 139.184.195.11
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Offer
DHCP: Subnet Mask = 255.255.0.0
DHCP: Renewal Time Value (T1) = 6:00:00
DHCP: Rebinding Time Value (T2) = 10:30:00
DHCP: IP Address Lease Time = 12:00:00
DHCP: Server Identifier = 139.184.195.11
DHCP: Domain Name = ids.ac.uk
DHCP: Router = 172.16.0.1
DHCP: Domain Name Server = 139.184.195.11 139.184.194.19
DHCP: End of this option field
Request: client says can I have the offer
1030 99.690570 00304F1E1134 *BROADCAST DHCP Request
(xid=74664FA6) 0.0.0.0 255.255.255.255 IP
IP: ID = 0x1FD; Proto = UDP; Len: 352
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 352 (0x160)
IP: Identification = 509 (0x1FD)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0x3791
IP: Source Address = 0.0.0.0
IP: Destination Address = 255.255.255.255
IP: Data: Number of data bytes remaining = 332 (0x014C)
DHCP: Request (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 0.0.0.0
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Request
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Requested Address = 172.16.1.1
DHCP: Server Identifier = 139.184.195.11
DHCP: Host Name = CATS2550
DHCP: Dynamic DNS updates = (Length: 24) 00 00 00 43 41 54 53 32
35 35 30 2e 61 64 2e 69 ...
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
DHCP relay agent forwards request:
1032 99.690570 000BCD4E8CC3 00306E1D9438 DHCP Request
(xid=74664FA6) 172.16.0.1 139.184.195.11 IP
IP: ID = 0x9714; Proto = UDP; Len: 352
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 352 (0x160)
IP: Identification = 38676 (0x9714)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0xA7A3
IP: Source Address = 172.16.0.1
IP: Destination Address = 139.184.195.11
IP: Data: Number of data bytes remaining = 332 (0x014C)
DHCP: Request (xid=74664FA6)
DHCP: Op Code (op) = 1 (0x1)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 1 (0x1)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 32576 (0x7F40)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP Request
DHCP: Client-identifier = (Type: 1) 00 30 4f 1e 11 34
DHCP: Requested Address = 172.16.1.1
DHCP: Server Identifier = 139.184.195.11
DHCP: Host Name = CATS2550
DHCP: Dynamic DNS updates = (Length: 24) 00 00 00 43 41 54 53 32
35 35 30 2e 61 64 2e 69 ...
DHCP: Client Class information = (Length: 8) 4d 53 46 54 20 35 2e 30
DHCP: Parameter Request List = (Length: 11) 01 0f 03 06 2c 2e 2f 1f
21 f9 2b
DHCP: End of this option field
NACK. What is going on!
1033 99.691546 00306E1D9438 *BROADCAST DHCP NACK
(xid=74664FA6) 139.184.195.11 255.255.255.255 IP
IP: ID = 0x19D7; Proto = UDP; Len: 328
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 328 (0x148)
IP: Identification = 6615 (0x19D7)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 128 (0x80)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0xD10A
IP: Source Address = 139.184.195.11
IP: Destination Address = 255.255.255.255
IP: Data: Number of data bytes remaining = 308 (0x0134)
UDP: IP Multicast: Src Port: BOOTP Server, (67); Dst Port: BOOTP Client
(68); Length = 308 (0x134)
UDP: Source Port = BOOTP Server
UDP: Destination Port = BOOTP Client
UDP: Total length = 308 (0x134) bytes
UDP: UDP Checksum = 0x7D89
UDP: Data: Number of data bytes remaining = 300 (0x012C)
DHCP: NACK (xid=74664FA6)
DHCP: Op Code (op) = 2 (0x2)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 0 (0x0)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 0.0.0.0
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 0.0.0.0
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP NACK
DHCP: Server Identifier = 139.184.195.11
DHCP: End of this option field
Then an ACK:
1034 99.693499 WATCHG040FD6 000BCD4E8CC3 DHCP ACK
(xid=74664FA6) 139.184.195.11 172.16.0.1 IP
IP: ID = 0x19D8; Proto = UDP; Len: 335
IP: Version = 4 (0x4)
IP: Header Length = 20 (0x14)
IP: Precedence = Routine
IP: Type of Service = Normal Service
IP: Total Length = 335 (0x14F)
IP: Identification = 6616 (0x19D8)
IP: Flags Summary = 0 (0x0)
IP: .......0 = Last fragment in datagram
IP: ......0. = May fragment datagram if necessary
IP: Fragment Offset = 0 (0x0) bytes
IP: Time to Live = 127 (0x7F)
IP: Protocol = UDP - User Datagram
IP: Checksum = 0x25F1
IP: Source Address = 139.184.195.11
IP: Destination Address = 172.16.0.1
IP: Data: Number of data bytes remaining = 315 (0x013B)
DHCP: ACK (xid=74664FA6)
DHCP: Op Code (op) = 2 (0x2)
DHCP: Hardware Type (htype) = 1 (0x1) 10Mb Ethernet
DHCP: Hardware Address Length (hlen) = 6 (0x6)
DHCP: Hops (hops) = 0 (0x0)
DHCP: Transaction ID (xid) = 1952862118 (0x74664FA6)
DHCP: Seconds (secs) = 0 (0x0)
DHCP: Flags (flags) = 0 (0x0)
DHCP: 0............... = No Broadcast
DHCP: Client IP Address (ciaddr) = 0.0.0.0
DHCP: Your IP Address (yiaddr) = 172.16.1.1
DHCP: Server IP Address (siaddr) = 0.0.0.0
DHCP: Relay IP Address (giaddr) = 172.16.0.1
DHCP: Client Ethernet Address (chaddr) = 00304F1E1134
DHCP: Server Host Name (sname) = <Blank>
DHCP: Boot File Name (file) = <Blank>
DHCP: Magic Cookie = 99.130.83.99
DHCP: Option Field (options)
DHCP: DHCP Message Type = DHCP ACK
DHCP: Renewal Time Value (T1) = 6:00:00
DHCP: Rebinding Time Value (T2) = 10:30:00
DHCP: IP Address Lease Time = 12:00:00
DHCP: Server Identifier = 139.184.195.11
DHCP: Subnet Mask = 255.255.0.0
DHCP: Dynamic DNS updates = (Length: 3) 00 ff 00
DHCP: Domain Name = ids.ac.uk
DHCP: Router = 172.16.0.1
DHCP: Domain Name Server = 139.184.195.11 139.184.194.19
DHCP: End of this option field