Networking problem

[JB]

Tom H <tomh0665 <at> gmail.com> writes:

> ...
> > Let's try a ping from Fedora to Powerbook.
> >
> > snip
> >
> > But, the situation is curious, because we have ping's IPv4-format packet with
> > FROM IPv4 address and TO IPv4 address going out thru IPv6-type interface
> 
> If you're referring to "192.168.1.254 0:1d:5a:c8:91:c1" as "FROM IPv4
> address and TO IPv4 address going out thru IPv6-type interface" then
> no. "0:1d:5a:c8:91:c1" is the MAC address of "192.168.1.254".

No, I was referring to Fedora-to-Powerbook comm, but from the point of view of
Fedora machine, in that paragraph:
> Let's try a ping from Fedora to Powerbook.
> ...

When I mentioned IPv6 in context of Fedora-to-Powerbook comm, I meant this
output.

On Fedora Machine:
# /sbin/ifconfig
...
wlan0     Link encap:Ethernet  HWaddr 00:34:56:00:03:43
           inet6 addr: fe80::234:56ff:fe00:343/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          ...
wlan0:0   Link encap:Ethernet  HWaddr 00:34:56:00:03:43
           inet addr:192.168.1.108  Bcast:192.168.1.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

For wlan0, this line shows an IPv6 link-local address (valid within the local
subnetwork !):
           inet6 addr: fe80::234:56ff:fe00:343/64 Scope:Link
It is UP and RUNNING, and so ready for communication on IPv6 and link layers.

It is a valid IPv6 interface.
The fact that IPv6 layer was disabled on the subnet (as JD clarified it later),
does not change anything. Once again, the type of configured interface wlan0
is of interest to me, that is IPv6-type.

Because wlan0 (not wlan0:0) does not have an IPv4 address assigned, I became
suspicious of what that means when wlan0 was utilized in Fedora's routing
table:

# /bin/netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
...
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0
wlan0
...
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0
wlan0

That was the reason I analyzed the IPv4 packet flow between Fedora and
Powerbook with "curiosity" with regard to wlan (IPv6-type interface) and
wlan0:0 (IPv4-type interface).

I am still not 100% clear what the implication of it is, so I would welcome
any authoritative comment(s) on this matter.

JB