Packet sniffers allow for users to determine packet length
In computer networking, a packet is the basic unit for data being sent across the network. Each packet contains information about its origin, its destination and its contents. Packets are sent when initiating a connection between two computers, during the connection itself and when a connection is broken. Some packets even contain other packets.
Instructions
Instructions for tcpdump
1. Open the command line software
2. Run tcpdump as follows:
tcpdump -v
3. Examine the tcpdump output. An example:
16:50:16.752851 IP (tos 0x0, ttl 64, id 26928, offset 0, flags [DF], proto TCP (6), length 46) yyy.yyy.yyy.yyy.22003 > zzz.zzz.zzz.zzz.5190: P, cksum 0x7d2a (correct), 2169864800:2169864806(6) ack 1098759742 win 62984
4. Find the 'length' section of the tcpdump output. In the given example, the length was 46, indicating a packet length of 46 bytes.
Instructions for WinDump
5. Open the command line software
6. Run tcpdump as follows:
windump -v
7. Examine the windump output. An example:
16:50:16.752851 IP (tos 0x0, ttl 64, id 26928, offset 0, flags [DF], proto TCP (6), length 46) yyy.yyy.yyy.yyy.22003 > zzz.zzz.zzz.zzz.5190: P, cksum 0x7d2a (correct), 2169864800:2169864806(6) ack 1098759742 win 62984
8. Find the 'length' section of the windump output. In the given example, the length was 46, indicating a packet length of 46 bytes.
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