The checksum in the UDP packet is set by the sending host and can be changed at which point?
Added by Jonathan T.
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The checksum is used to verify the integrity of the data in the UDP packet, ensuring that it has not been corrupted during transmission. Show more…
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UDP Format & Checksum Assume: Source port = 33152 (=0x8180) Dest port = 49156 (=0xC004) Length = 12 (=0x000c) Payload = 0x2048 0x8378 32 bits source port # dest port # length checksum application data (payload) Show a UDP segment with a calculated checksum In the receiver side, what is the 16-bit sum of the entire fields? UDP segment format
Akash M.
When bit stuffing is used, is it possible for the loss, insertion, or modification of a single bit to cause an error not detected by the checksum? If not, why not? If so, how? Does the checksum length play a role here?
Chandra J.
Using the prescribed syntax of an Internet Protocol packet, construct an IP Version 4 TCP/IP transmission packet using the following particulars: The packet is sent from IP address 192.168.4.111 (MAC address 4c:79:6e:86:b0:2d) to IP address 3.208.72.68 (MAC address 8c:3b:ad:f0:dc:e0) with the following fields (You don't have to convert these values to binary, but realize that the packet will be a binary encoding of these. A bit is a digital 0 or 1. 0x00 is hexadecimal notation, where each digit 0 - F represents 4 bits. 0 = 0000, 1 = 0001 up to 9 = 1001 where we run out of decimal digits so continue with A=1010 through F=1111. A byte = 8 bits = 1 ASCII character): IP Header Length is counted as the number of 32-bit words from Diff Serv through the end of the checksum. Differentiated Services: 0x00 (equals 00000000 in binary bits). Total Length is the number of bytes in the payload (data field). Identification: 0xe0f9. Flags: 010 (First bit is always 0, Second bit is set to not fragment packet, Third bit is fragments). Fragment Offset: 0x00. Time to Live: 0x80 (=128 hops). Protocol: 0x06 (TCP). Header Checksum: 0x0000. Source Port: 0xd19d (=53661 in decimal). Destination Port: 0x01bb (=443 in decimal). Sequence Number: 0x4066faf8. Acknowledgment Number: 0x6993afc2. Data Offset: 0x5. TCP Flags: 0x010 (5th flag bit = Acknowledgment). Window Size: 0x01fd (=509 in decimal). Checksum: 0x1146. Urgent Pointer: 0x0000.
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