ZyXEL Communications P-2302HWUDL-P1 Support Notes page 34

+ 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 ZyXEL router. And from the second
trace, we know the ZyXEL router will send a reply to the client accordingly. The following sample filter will
utilize the 'Generic Filter Rule' to block the MAC address
1. First, from the incoming LAN packet we know the uninteresting source MAC address starts at the 7th Octet
TIME: 37c060 enet0-RECV len:74 call=0
0000: [00 a0 c5 01 23 45]
0010: 00 3c eb 0c 00 00 20 01 e3 ea ca 84 9b 5d ca 84
0020: 9b 63 08 00 45 5c 03 00 05 00 61 62 63 64 65 66
0030: 67 68 69 6a 6b 6c 6d 6e 6f 70 71 72 73 74 75 76
0040: 77 61 62 63 64 65 66 67 68 69
2. We are now ready to configure the 'Generic Filter Rule' as below.
[00 80 c8 4c ea 63]
All contents Copyright  2007 ZyXEL Communications Corporation.
P2302HWUDL-P1 Support Notes
[00 80 c8 4c ea 63].
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