This is our old Q&A Site. Please post any new questions and answers at ask.wireshark.org.

Dear Sir,

I am allocating IP addr with DHCP Server to my clients with 300Sec a leased time...

I understood renewal time = 50% * leased time, hence After 150 sec i am expecting request from clients to sever for renewal....

But when i captured traffic by wireshark, DHCP request interval from client is not uniform and varying between 117sec to 147sec...

Why ? What could be the reason???

Regards M Srinivasa Rao

asked 15 Apr '15, 20:09

srinu_bel's gravatar image

srinu_bel
20151620
accept rate: 0%


See section 4.4.5, "Reacquisition and expiration," of RFC 2131, "Dynamic Host Configuration Protocol." Two times, T1 and T2, are defined. T1 is the renewal time. It defaults to 50% of the lease time, but the server can specify a different value.

The RFC gives two reasons why the client might try to renew its lease at times that are not exactly equal to T1:

  1. "Times T1 and T2 SHOULD be chosen with some random 'fuzz' around a fixed value, to avoid synchronization of client reacquisition."
  2. "The client MAY choose to renew or extend its lease prior to T1."
permanent link

answered 15 Apr '15, 21:23

Jim%20Aragon's gravatar image

Jim Aragon
7.2k733118
accept rate: 24%

edited 16 Apr '15, 13:41

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×44

question asked: 15 Apr '15, 20:09

question was seen: 2,379 times

last updated: 16 Apr '15, 13:41

p​o​w​e​r​e​d by O​S​Q​A