Tag Archives: nat

BT Retail Tests Controversial Carrier Grade NAT IP Address Sharing

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The technique has been criticised because it imposes certain limits on users by virtue of the fact that their broadband connection no longer has the use of a fixed unique IP address, but is rather sharing an address with other users – in BT’s trial, up to nine other users. This means, for instance, that users can’t serve content to the wider Internet from servers on their home network; and BT admits that it can also affect activities such as online gaming and dynamic DNS services.

via BT Retail Tests Controversial Carrier Grade NAT IP Address Sharing.

IPv4 address transfer markets are forming where we least expected

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And indeed, in the APNIC region, 191,744 addresses were transferred in 2011 with another 713,216 in the first half of 2012. In the RIPE region Europe, the former Soviet Union, and the Middle East, the researchers couldn’t find any address transfers. But surprisingly, in the ARIN region North America—where there is no immediate shortage—no less than 821,504 addresses were transferred in 2011 with 4.22 million in the first half of 2012.

via IPv4 address transfer markets are forming where we least expected | Ars Technica.

But we now know there are other players than ISPs looking to secure enough IPv4 addresses for the medium term. There’s also the possibility that address trading will take off once trading between regions becomes a possibility, so that address-starved Asians can buy up addresses from North American companies such as HP. That company happens to be sitting on more than 33 million addresses. Or consider the US government, which has more than 168 million. Ultimately, maybe the money is better spent upgrading to IPv6 instead.

Example of a full nat solution with QoS

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Here I’m describing a common set up where we have lots of users in a private network connected to the Internet trough a Linux router with a public ip address that is doing network address translation (NAT). I use this QoS setup to give access to the Internet to 198 users in a university dorm, in which I live and I’m netadmin of. The users here do heavy use of peer to peer programs, so proper traffic control is a must. I hope this serves as a practical example for all interested lartc readers.

Via Example of a full nat solution with QoS.