Hi, just a general question about our public IP addresses, are they shared between customers?
I thought our IPs are dynamic so you might get a different one every so often, but thought they'd be unique for each customer.
Anyone know if this assumption is correct?
Thanks
Our Public IP & customer host name have not changed in at least 5 years,
however it is a dynamic IP and could change without warning.
To see the customer host name : nslookup <Public IP>
Two things will possibly change it:
1) Having a hub replaced. Just had mine replaced & after 7 years I now have a different IP.
2) A change of CMTS allocation at the headend.
Thanks @Client62 & @nodrogd
I get that our IPs might change over time, but is it unique? As in only one customer can have a particular IP at a time?
No, they are not shared. VM did trial IPv6 using dual stack lite prior to covid, that would have meant effectively that IPv4 was using CGNAT. The fact that VM didn't roll it out nationwide should speak volumes as to how well that worked out.
ravenstar68 said "The fact that VM didn't roll it out nationwide should speak volumes as to how well that worked out." Surprising as a lot of thing from VM do not work very well!
Yes. The internet would not work if it was shared. That’s why we are running out of IP v4 addresses.
Tudor wrote:Yes. The internet would not work if it was shared. That’s why we are running out of IP v4 addresses.
The main internet registries ran out of IPv4 addresses to allocate over a decade ago. The fact that companies like Virgin Media still have IPv4 addresses to use demonstrates how wasteful the allocation was.
VM do not use CGNAT or MAP-T, so you do not 'share' your public IP address with other customers.
At some VM may go the AI one IP shared between two each getting the same WAN IP CGNAT but not yet
As to the problem you can't have say one WAN IP split port 80 inbound between two but with AI it can check by send a SYN down each MAC on the shared WAN IP and seeing who replies then if only one replies traffic going to to that MAC same with UDP or protocol 47, 50 only no SYN as for ICMP its like if one replies and the other don't well its allowed.
That is the short version of what we will see to keep IPv4 alive
Let's not forget our VM IE friends are already on CGNAT for IPv4, along with IPv6. However most of the VM IE gaming community request a single IPv4 and lose the IPv6 address. Hopefully LG will not go down that route in the UK?
At least with my BT connection I have a single IPv4 and get IPv6 as well. The downside is the IPv4 address does change quite often.
