Communityfibre router does not change IP address

As stated in the title, my IP address has been the same for over a year and does not change via a restart. Quite annoying as i've been the target of DDoS attacks. Is there any way to force an IP change within the linksys settings without having to call the service provider?

In reply to a post by escolol:

As stated in the title, my IP address has been the same for over a year and does not change via a restart. Quite annoying as i've been the target of DDoS attacks. Is there any way to force an IP change within the linksys settings without having to call the service provider?

If it's a dynamic IP address then you need to have the router off for longer than the lease period, what the lease period is I have no idea sadly.

1440 minutes (24 hours). am I able to lower it to 1 hour & have it change my IP?

In reply to a post by escolol:

1440 minutes (24 hours). am I able to lower it to 1 hour & have it change my IP?

Lease period for the WAN IP is set by the ISPs end, not your router.

You may want to look into using a VPN.

Edited by jchamier (Thu 24-Nov-22 20:47:06)

In reply to a post by jchamier:

In reply to a post by escolol:

1440 minutes (24 hours). am I able to lower it to 1 hour & have it change my IP?

Lease period for the WAN IP is set by the ISPs end, not your router.

You may want to look into using a VPN.

alright, thanks a lot!

In reply to a post by escolol:

1440 minutes (24 hours). am I able to lower it to 1 hour & have it change my IP?

No, this is defined within the DHCP scope at the provider's end.

Actually, a DHCP client is able to request its lease period. However the server will enforce a maximum, and could enforce a minimum.

https://datatracker.ietf.org/doc/html/rfc2131#sectio...
https://datatracker.ietf.org/doc/html/rfc2132#sectio...

"The DHCPDISCOVER message MAY include options that suggest values for the network address and lease duration."

So in principle (based on standard DHCP behaviour, not what CommunityFibre implements), you could:

* change your router to request a 1 hour lease
* wait up to 24 hours for the old lease to expire

and then you ought to be on 1 hour leases - unless CF's DHCP server ignores the client requested lease duration.

Thanks for that extra information

If you had to say the likelihood (as a percentage) that the OP could use what you have said on their Community Fibre connection to change the lease time what would that figure be out of interest?

In reply to a post by candlerb:

Actually, a DHCP client is able to request its lease period.

Its possible but very unlikely. If you have a Linux based computer, it should be easy to update in such things as dhcpc config but I doubt you can do it on Windows (at least without messing with registry) and it may be impossible on MacOS. And consumer grade routers will be 'black boxes'.

OP just said "the linksys settings". If they are running something like OpenWRT or DD-WRT then it's probably easy to do. If they are using vendor-supplied or provider-supplied firmware then I agree that the option may not be available.

In reply to a post by candlerb:

If they are using vendor-supplied or provider-supplied firmware then I agree that the option may not be available.

Fully agree, anyone running a WRT type OS is in a different category.

I was told that CF use what they call a Hard Sticky IP's that they link up to your MAC of your routers port connected to the modem, so your connection will only work with said router unless you phone them up to clear the old MAC their system their end.

TBH I have no issues phoning them up to have a new IP allocated to my connection or to have my MAC removed from their system allowing me to swap routers.

But saying that, it would be nice if they setup a web interface for us to login and release & renew the public IP and to be able to clear the MAC.

Paul