How to randomize the source port used during DNS lookup?
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I am trying to send multiple DNS queries serially using the dig utility on Ubuntu16.04. I have a file that contains the list of websites.
dig -f <file> +short
From tcpdump I see that dig is reusing the same source port for every dns request. How do I randomize the source port?
The man page for dig and other google search results say that dig randomizes source port by default. But I don't see that happening.
16.04 dns
asked May 4 at 19:34
Vinay Sheshadri
11113
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up vote
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down vote
favorite
I am trying to send multiple DNS queries serially using the dig utility on Ubuntu16.04. I have a file that contains the list of websites.
dig -f <file> +short
From tcpdump I see that dig is reusing the same source port for every dns request. How do I randomize the source port?
The man page for dig and other google search results say that dig randomizes source port by default. But I don't see that happening.
16.04 dns
asked May 4 at 19:34
Vinay Sheshadri
11113
Please don't use screenshots for terminal output. Instead, paste the text into the question editor, select that text, and press thebutton to format it properly.
– Chai T. Rex
May 4 at 21:39
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am trying to send multiple DNS queries serially using the dig utility on Ubuntu16.04. I have a file that contains the list of websites.
dig -f <file> +short
From tcpdump I see that dig is reusing the same source port for every dns request. How do I randomize the source port?
The man page for dig and other google search results say that dig randomizes source port by default. But I don't see that happening.
16.04 dns
asked May 4 at 19:34
Vinay Sheshadri
11113
I am trying to send multiple DNS queries serially using the dig utility on Ubuntu16.04. I have a file that contains the list of websites.
dig -f <file> +short
From tcpdump I see that dig is reusing the same source port for every dns request. How do I randomize the source port?
The man page for dig and other google search results say that dig randomizes source port by default. But I don't see that happening.
16.04 dns
asked May 4 at 19:34
Vinay Sheshadri
11113
asked May 4 at 19:34
Vinay Sheshadri
11113
asked May 4 at 19:34
Vinay Sheshadri
11113
asked May 4 at 19:34
Vinay Sheshadri
11113
11113
Please don't use screenshots for terminal output. Instead, paste the text into the question editor, select that text, and press thebutton to format it properly.
– Chai T. Rex
May 4 at 21:39
add a comment |Â
Please don't use screenshots for terminal output. Instead, paste the text into the question editor, select that text, and press thebutton to format it properly.
– Chai T. Rex
May 4 at 21:39
Please don't use screenshots for terminal output. Instead, paste the text into the question editor, select that text, and press the
– Chai T. Rex
May 4 at 21:39
Please don't use screenshots for terminal output. Instead, paste the text into the question editor, select that text, and press the
– Chai T. Rex
May 4 at 21:39
add a comment |Â
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Please don't use screenshots for terminal output. Instead, paste the text into the question editor, select that text, and press the
button to format it properly.– Chai T. Rex
May 4 at 21:39