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P-2602HWNLI Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
54
The detailed format of the Ethernet Version II:
+ Ethernet Version II
- Address:
00-80-C8-4C-EA-63 (Source MAC)
----> 00-A0-C5-23-45
(Destination MAC)
- Ethernet II Protocol Type: IP
+ Internet Protocol
- Version (MSB 4 bits): 4
- Header length (LSB 4 bits): 5
- Service type: Precd=Routine, Delay=Normal, Thrput=Normal, Reli=Normal
- Total length: 60 (Octets)
- Fragment ID: 60172
- Flags: May be fragmented, Last fragment, Offset=0 (0x00)
- Time to live: 32 seconds/hops
- IP protocol type: ICMP (0x01)
- Checksum: 0xE3EA
- IP address 202.132.155.93 (Source IP address) ---->
202.132.155.99(Destination IP address)
- No option
+ Internet Control Message Protocol
- Type: 8 - Echo Request
- Code: 0
- Checksum: 0x455C
- Identifier: 768
- Sequence Number: 1280
- Optional Data: (32 bytes)
Configurations
From the above first trace, we know a client is trying to ping request the Prestige router. And from the second
trace, we know the Prestige router will send a reply to the client accordingly. The following sample filter will
utilize the 'Generic Filter Rule' to block the MAC address
[00 80 c8 4c ea 63]
.
1. First, from the incoming LAN packet we know the uninteresting source MAC address starts at the 7th Octet