IP Address Leasing:

Dell / N/A
September 18, 2009 at 13:41:43
Specs: Server 2003, N/A
To whom it may concern,

currently my router is set to lease out my ip address every hour. I'm trying to understand what would the difference be if I put it to 48hrs or even 24hrs. I understand what the feature does but is it better to lease the ip after a certain amount of time?

Much appreciated


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#1
September 18, 2009 at 13:45:27
As far as a private, home network goes, there's no real advantage to having a short lease time on IP addressing.

I leave my lease time at the router's default and forget about it. As far as I'm concerned at home, where lease times go, the longer the better.....lol


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#2
September 18, 2009 at 13:50:32
My apologies.... what about a business network? Is there advantages and disadvantages?

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#3
September 18, 2009 at 14:01:50
If you have a dynamically assigned ip address, I would suggest to change the ip every 24h.

The advantage is, when someone is trying to hack you system, after 24h, he first, find your machine again, which is most unlikely, and second, he has to start from the beginning.

To change the ip every hour makes really no sense.
Another thing is, if you have a real small environment and don't provide services like webserver of something like that, you might configure the router to cut the internet connection, if it is not used for an amount of time.
E.g. If internet is not uses for 20 minutes, the router cuts the line and reconnects automatically if needed.


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Related Solutions

#4
September 18, 2009 at 14:10:39
That was very helpful!! Thank you

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#5
September 18, 2009 at 15:02:19
Actually, most SOHO level routers will just reassign the exact same IP to the same MAC address. So you could technically set it to an hour, a day, week, a month etc and the IP will always be the same.

This is why I never bother changing the lease times. I don't even know if you could set a SOHO router to force a new IP each refresh. So, unless you fix it to force a new IP each time, there's no security benefit to shorter lease times.


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#6
September 18, 2009 at 15:07:30
@Curt R
I guess, we are talking about public ip addresses from the ISP.
Most ISPs will give you a new ip address on disconnect and reconnecting.

Changing internal ip addresses makes absolutely no sense. The standard lease time of 3 days is ok, espacially when a pc is corrupt and will be substituted.


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#7
September 18, 2009 at 18:11:12
From what I have seen locally ISP's seem to have enough to keep a public IP to a soho user for quite some time. Even though the lease renews.

For private IP's there are mostly two reasons to lease.

One is lack of IP addresses. I doubt it applies here.

Two is hardware and physical changes. Most soho users don't change that much but laptop and wireless might cause issues.

You have a benefit to keep as long of times as possible. It can take up to twenty minutes to resolve computer names back to the correct IP if the lease offers new IP addresses.

Most soho uses could live with static if they wanted also.

Playing to the angels
Les Paul (1915-2009)


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#8
September 19, 2009 at 05:32:00

I guess, we are talking about public ip addresses from the ISP.
Most ISPs will give you a new ip address on disconnect and reconnecting.

Changing internal ip addresses makes absolutely no sense. The standard lease time of 3 days is ok, espacially when a pc is corrupt and will be substituted.

Argh!

Again, I misread the OP. Thanks Paul, upon rereading it carefully I see that's what he's talking about alright.
*slapping self on forehead*


For what it's worth, the customer doesn't control the ISP's lease times. I don't even know what my lease time is for my ADSL here at home. All I know is the MAC of whatever is connected to the modem controls my IP. If I change the MAC, I get a new IP. Otherwise, I don't. I've had the same IP for a couple years now.

Conversely, my best friend back home has ADSL from another provider (of course - he lives over 400 miles away right) has a setup wherein his IP changes constantly throughout the day, even if he never powers off his PC or changes anything.

I know why his ISP does that. It prevents people from running websites from home, or P-to-P software, if they don't know about the online proxy's and dynamice DNS that's available.

I will say, it's particularly annoying when we're trying to game because I've literally seen his IP change 30 seconds after he just looked at it on 'whatsmyip'. I think their lease time is like 10 minutes.


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#9
September 19, 2009 at 05:53:43
I never heared about a lease time of 10 minutes.
For that, the DNS and DHCP servers of the provider are always on heavy access.
Lease time of one day, without rebooting the router, is often used by the ISPs.
But if a user reboots his router, he gets a new IP address.
I also know about ISPs, who never changes the IP address. But they are absolutely rare because of the reasons you mentioned above.

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