[PLUG] Centos on Comcast ipv6to4 Help

[david]

At 01:06 PM 12/14/2014, you wrote:
>On Sun, Dec 14, 2014 at 10:41:07AM -0800, david wrote:
> > At 10:27 AM 12/14/2014, you wrote:
> > Thanks for the prompt response.  I'm not sure what you mean by "going
> > to".  Externally, I'm on an IPV4 system, and the router does have an
> > IPV4 address.  So, when I try
> > ssh <name>@ipv4-address
> > and when I have port forwarding set for port 22 to an 192.168
> > (internal IPV4 address) of the box,
> > I'd expect it to get to the centos box, but it doesn't.
>
>You might be surprised to find out you and he have IPv6 addresses.
>the command `ip -6 addr` will show you if there are.  An example:
>
>     michael at hive ~ % ip -6 addr
>     1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536
>         inet6 ::1/128 scope host
>         valid_lft forever preferred_lft forever
>     2: enp0s10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
>         inet6 fdb5:1967:1a58::267/128 scope global noprefixroute dynamic
>         valid_lft 73408sec preferred_lft 73408sec
>         inet6 2601:7:8c0:70::267/128 scope global noprefixroute dynamic
>         valid_lft 73408sec preferred_lft 73408sec
>         inet6 fdb5:1967:1a58:0:e287:c970:f0ab:7abe/64 scope global 
> noprefixroute dynamic
>         valid_lft 7195sec preferred_lft 1795sec
>         inet6 2601:7:8c0:70:937f:82b1:6a3d:44cd/64 scope global 
> noprefixroute dynamic
>         valid_lft 7195sec preferred_lft 1795sec
>         inet6 fe80::1a7d:220c:5129:9b6e/64 scope link
>         valid_lft forever preferred_lft forever
>
>The /128 ones are of interest, the /64 are actually network addresses.  So
>
>     michael at hive ~ % ip -6 addr | grep /128
>         inet6 ::1/128 scope host
>         inet6 fdb5:1967:1a58::267/128 scope global noprefixroute dynamic
>         inet6 2601:7:8c0:70::267/128 scope global noprefixroute dynamic
>
>Address ::1 is the IPv6 equivelent of 127.0.0.1
>Address fdb5... is the IPv6 equivelent of IP4 RFC 1918 private 
>address space, the 10.x.y.z, 192.168.x.y etc.
>The third address 2601:... is the one of interest.  You mentioned 
>Comcast - your friend may (probably?) has
>one of those.

I would be surprised.  I'm on a Windows7 box, and at home I have no 
IPv6 address.  Not even my gateway to my IPV4 provider (NOT comcast) 
has only an ipv4 address.  So, I'm lost.