We continue in this series by having a quick look at a dual stack VPS host.
Alas many providers, including my ISP, do not yet offer IPV6 addresses. Fortunately my hosting provider does. I have a multipurpose VPS with them. Before this article the VPS had one IPV4 address. Using my provider's website I requested an IPV6 address. It’s worth noting that an IPV4 address costs me €2.00 per month. An IPV6 address cost only €0.10 per month.
After I made the request, I returned a day later expecting to have to set things up. I was surprised to see everything just worked. IPV6 address can be assigned by stateless configuration. This is built in to IPV6 beyond regular use of DHCPv6. I'm not sure how my provided assigned the IP but it must have been easy and automatic.
venet0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:127.0.0.1 P-t-P:127.0.0.1 Bcast:0.0.0.0 Mask:255.255.255.255 inet6 addr: ::1/128 Scope:Host inet6 addr: 2a02:750:5::464/128 Scope:Global UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1 RX packets:13899581 errors:0 dropped:0 overruns:0 frame:0 TX packets:11227895 errors:0 dropped:6422 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:13392292622 (12.4 GiB) TX bytes:1196669117 (1.1 GiB) venet0:0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:22.214.171.124 P-t-P:126.96.36.199 Bcast:0.0.0.0 Mask:255.255.255.255 UP BROADCAST POINTOPOINT RUNNING NOARP MTU:1500 Metric:1
This host has one IPV4 address and one IPV6 address. I can access the host through IPV4 and my IPV6 tunnel.
PING 188.8.131.52 (184.108.40.206) 56(84) bytes of data. 64 bytes from 220.127.116.11: icmp_req=1 ttl=50 time=145 ms 64 bytes from 18.104.22.168: icmp_req=2 ttl=50 time=145 ms 64 bytes from 22.214.171.124: icmp_req=3 ttl=50 time=145 ms --- 126.96.36.199 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2001ms rtt min/avg/max/mdev = 145.177/145.509/145.784/0.251 ms PING 2a02:750:5::464(2a02:750:5::464) 56 data bytes 64 bytes from 2a02:750:5::464: icmp_seq=1 ttl=53 time=160 ms 64 bytes from 2a02:750:5::464: icmp_seq=2 ttl=53 time=159 ms 64 bytes from 2a02:750:5::464: icmp_seq=3 ttl=53 time=158 ms --- 2a02:750:5::464 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 158.861/159.709/160.406/0.718 ms
Assigning both IPV4 and IPV6 addresses is a good way to transition to IPV6. It allows the host to access both worlds. Most reputable network services will happily work on both types of addresses. Just be aware that services like DHCP and packet filtering are entirely separate.