On 2008-10-15, Elvir Kuric <omasnjak@xxxxxxxxx> wrote: > > I am wondering does someone has experinece with translation from ipv6 > ---> ipv4 `Translating' is not proper word unless you mean real NAT-PT (Network address translation and protocol translation). If you want just to connect your IPv6 island via IPv4 Internet to native IPv6 Internet backbone (i.e. bypass your lazy ISP), use 6to4 (in case you have public IPv4 address on your gateway) or AYIYA (in other case). This is called tunneling and former post enlightened it already. If you want to be able to connect from your IPv6 host to IPv4 only servers in IPv4 Internet, you have to choices: Provide to all IPv6 hosts IPv4 connectivity (i.e. dual stack solution), or do NAT-PT on your gateway. NAT-PT translates one protocol family into other one. However due to some differences between these two protocols, the translation is not seamless (like IPv4 NAPT). Thus there exist few limitations and different solutions how to achieve it. I know only about RFC3142 (An IPv6-to-IPv4 Transport Relay Translator) implementation and it's pTRTd <http://www.litech.org/ptrtd/> and totd (http://www.vermicelli.pasta.cs.uit.no/software/totd.html). It works following: IPv6 only client asks totd name server for AAAA record of IPv4 only host. The name server provides fake answer resolving to network prefix routed to pTRTd server. Then your client sends IPv6 TCP or UDP packet to given fake IPv6 address, the packet recieves pTRTd server (a userspace daemon capturing packets on TUN network interface), pTRTd established mapping between IPv6 and IPv4 transport addresses, translates the packet into IPv4 protocol and transmits it to the real IPv4 only host in IPv4 Internet. Of course the pTRTd processes returing responses and forward them to your IPv6 client as IPv6 packets. Thus your IPv6 only hosts can see whole IPv4 world as a subnet in IPv6 address space. -- Petr -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
