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Question related tracert

Question related tracert

Created: Feb 19, 2022 18:27:38Latest reply: Feb 25, 2022 16:11:41 148 6 0 0 0
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the TracertRoute function on the router device, in the data packet sent by the router, what is the value of the Protoco1 field in the IPv4 header?


A. 1

B. 17

C. 2

D. 6


Can you please confirm that correct answer is A (ICMP protocol)? In some dumps I see as right answer B (UDP).

Please confirm

Thanks

Marco

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DDSN
Admin Created Feb 20, 2022 01:40:20

Hi mturco84,

Huawei tracert command sends UDP packets that the TTL equals 1. Therefore, for Huawei, the protocol field is 17.
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Zonger
Zonger Created Feb 19, 2022 18:35:11

Hi,

The Protocol field in the IPv4 header contains a number indicating the type of data found in the payload portion of the datagram. The most common values are 17 (for UDP) and 6 (for TCP). This field provides a demultiplexing feature so that the IP protocol can be used to carry payloads of more than one protocol type.


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mturco84
mturco84 Created Feb 19, 2022 19:47:44

Please other answers, thanks
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sebr
sebr Created Feb 19, 2022 20:45:55

Hi there,
It depends on the platform which is sourcing the packets. traceroute run on a router/ unix device will use UDP packets (value 17), where as the Windows implementation uses ICMP packets (value 1).

cheers,
Seb.

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mturco84
mturco84 Created Feb 19, 2022 21:50:31

for Huawei I mean which is the right answer?
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DDSN
DDSN Admin Created Feb 20, 2022 01:40:20

Hi mturco84,

Huawei tracert command sends UDP packets that the TTL equals 1. Therefore, for Huawei, the protocol field is 17.
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Saqibaz
Saqibaz Created Feb 25, 2022 16:11:41

Thanks for sharing
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