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311 posts

Ultimate Geek
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Topic # 68133 15-Sep-2010 13:28
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Hello,

Is there a new policy to automatically give a static IP address to ADSL customers? I'm on a 20gig plan and I have the same IP address since day one.
I was also a customer of xtra in Wellington and over there I used to get a new IP address every time the modem was disconnecting / connecting.

Thanks. 

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1088 posts

Uber Geek
+1 received by user: 66


  Reply # 380157 15-Sep-2010 14:38
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You will probably find that they have just assigned the same dynamic address to your modem.

If you are familiar with DHCP on Windows Servers you will find that it generally just assigns the same address to the hardware each time the machine boots. I think this is so that DNS entries don't need to be updated so often and it will reduce some of the overhead. This will be slightly different for ISPs but I beleive the concept will be the same.

Vodafone, for example just creates a reservation for your modem username when you purchase a "static IP" My issue with this is that some spam blacklists recongnise that the address is part of a dynamic range and will blacklist it (based on my past experiences)

That being said, I wouldn't rely on the address always being the same.

Oh, of course if you purchased a business ADSL plan then most of them come with free static ip addresses these days.

172 posts

Master Geek


  Reply # 380160 15-Sep-2010 14:43
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AFAIK you still need to signup/request for a static IP. Free with Pro or above and approx $20/month on cheaper plans. If you have a stable connection you can find that the IP will stay the same until you reboot the router or change plans.

If this is a fairly new connection you can find that the lease period does appear to be quite a bit longer ie you need to turn the modem off for quite a lengthy period before you will be assigned a new IP.

 
 
 
 


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  Reply # 380163 15-Sep-2010 14:44
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jaymz: You will probably find that they have just assigned the same dynamic address to your modem.

If you are familiar with DHCP on Windows Servers you will find that it generally just assigns the same address to the hardware each time the machine boots. I think this is so that DNS entries don't need to be updated so often and it will reduce some of the overhead.


This is actually because as part of the DHCP request, your PC (or device) will request the same address it had last time. The DHCP server doesn't have to allocate the address, but if it's free it will (depending on how it's setup)

I'm only talking a very simple setup here btw, not one with MAC->IP mappings etc.

Tim




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1088 posts

Uber Geek
+1 received by user: 66


  Reply # 380167 15-Sep-2010 14:53
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muppet:
jaymz: You will probably find that they have just assigned the same dynamic address to your modem.

If you are familiar with DHCP on Windows Servers you will find that it generally just assigns the same address to the hardware each time the machine boots. I think this is so that DNS entries don't need to be updated so often and it will reduce some of the overhead.


This is actually because as part of the DHCP request, your PC (or device) will request the same address it had last time. The DHCP server doesn't have to allocate the address, but if it's free it will (depending on how it's setup)

I'm only talking a very simple setup here btw, not one with MAC->IP mappings etc.

Tim


DUH!! I should have known better! Embarassed

Thanks for clearing it up Smile

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