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20-16 SmartSwitch 1800 4.0 User Guide, Rev 01
14
= Time To Live (14 seconds/hops)
11
= Protocol (hex 11 is 17 UDP, hex 01 is 01 ICMP, hex 06 is 06 TCP, etc…)
9E 65
= IP header checksum
02 02 02 02
= IP source address
02 02 02 01
= IP destination address
0208
= UDP source port (520)
0208
= UDP destination port (520)
0020
= UDP length (20 hex is 32 decimal)
EE93
= UDP header checksum
02
= RIP Command byte (Response)
01
= RIP Version 1
00 00
= must be zero
03000000
= IP address (reporting route to network
3.0.0.0
)
00000000
= must be zero
00000000
= must be zero
00000000
= Metric (hops 1-15; note that 16 is unreachable)
ARP (bridged IP) Request packet traced on DLCI 16:
0016 (0076) 0300800080C20007FFFFFFFFFFFF0080C7193D800036AAAA03
0000F8080600010800060400010080C7193D80C6554ABC0000
00000000C6554A015F4C5445585400000400000000000000A029
03
= Q.922 control byte
00
= Pad byte
80
= SNAP NLPID for a bridged 802.3 frame
0080C2
= OUI
0007
= PID
FFFF FFFF FFFF
= Destination MAC address
0080C7193D80
= Source MAC address
0036
= length of packet in hex (54 bytes follow)
AAAA03
= SNAP Header
0000F8
= Protocol ID (SNAP OUI will see 000000 or 00000C)
0806
= Ethertype (ARP)
0001
= Hardware (Ethernet 10MB)
0800
= Protocol = Ethertype (DOD-IP)
06
= Hardware address length
04
= Protocol address length
0001
= Op Code (
1
= ARP request,
2
= ARP reply,
3
= RARP request,
4
= RARP
reply)
0080C7193D80
= Sender's hardware address (MAC address)|
C6554ABC
= Sender's protocol address (IP address)
000000000000
= Target hardware address (MAC address)
C6554A01
= Target protocol address (IP address)
The rest is Ethernet padding.