ZyXEL Communications P-334WT Technical Information PDF herunterladen (Seite 125)

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 P-334WT router. And from the

second trace, we know the P-334WT 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

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ZyXEL Communications P-334WT Technical Information Seite 125