INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

IPv4 Communication and Loopback

IPv4 Communication and Loopback

(OP)
Is it possible for a network adapter to have more than one IP address? in other words can an adapter simultaneously communicate using more than one IP address and on more than one subnet?

If not then on a DHCP enabled network is it possible to change the adapter settings manually to some arbitrary IP address on any subnet and start communicating successfully?

Also, out of curiosity I ran a netstat command on my current machine and found there were several TCP connections established using my 192... IP address however there were several connections established on the loopback IP address 127.0.0.1. What typically is the loopback address used for on a Windows machine?

RE: IPv4 Communication and Loopback

One obvious use of the loopback address is to snuff the DNS of ads on web pages. DNS only occurs if the local machine doesn't know the IP address of the data that's being fetched, so by a priori assigning the loopback address to ad servers in your Hosts file, the local machine will not be able to retrieve ads from the server farms.

If you really want to get into the details of your posting, you should go to Tek-Tips.com, which is the sister site of this one, but is almost entirely geared for computer hardware and software questions.

TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers


Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx

RE: IPv4 Communication and Loopback

Yes it can have more than one IP address

If you go into the IPV4 adapter properties

1) Switch off "Obtain an IP address automatically" - this is the DHCP option
2) Set an address to use and the subnet mask
3) Click on advanced
4) Add more addresses and different subnet masks

When you've OKed all the dialogs, pop up a cmd prompt and type

ipconfig /all

You should see all the addresses. You normally need to do this if you're receiving broadcast as well as multicast

RE: IPv4 Communication and Loopback

(OP)
Thank you so how about on a DHCP enabled network? Is it possible for the DHCP server to lease more than one IP address? Or how about simultaneously having a DHCP leased address and an address set on local machine?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close