Cabletron Systems 1800 - Manual (Page 314)

20-16 SmartSwitch 1800 4. 0 User G uide, 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
FFFFFFFFFFFF = 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.