Couple of questions: Scope:Compat vs. Scope:Global
Hi. I'm experimenting with IPv6. Earlier, I wrote about tunnel
problems, the result of which is I'm waiting to establish the tunnel
until I can put a PC in place of the router, and terminate the tunnel
there rather than on an internal machine. NAT is a great security
shortcut, but it does indeed have its limitations.
This morning (insomnia sucks) I've been trying v6 between my two
debian systems, through a Linksys WAP11. The WAP11 is, as far as I
can tell, a v4 device only, but it seems to be passing v6 traffic
without problems:
====
$ ping6 ::192.168.1.20
PING ::192.168.1.20(::192.168.1.20) 56 data bytes
64 bytes from ::192.168.1.20: icmp_seq=1 ttl=64 time=5.01 ms
64 bytes from ::192.168.1.20: icmp_seq=2 ttl=64 time=5.98 ms
64 bytes from ::192.168.1.20: icmp_seq=3 ttl=64 time=4.05 ms
====
and
====
$ ping6 fef::192:168:1:20
PING fef::192:168:1:20(fef::192:168:1:20) 56 data bytes
64 bytes from fef::192:168:1:20: icmp_seq=1 ttl=64 time=4.94 ms
64 bytes from fef::192:168:1:20: icmp_seq=2 ttl=64 time=4.88 ms
64 bytes from fef::192:168:1:20: icmp_seq=3 ttl=64 time=7.45 ms
====
Ssh also works, but ftp doesn't. I tried command line ftp, lftp, and
ftp://fef::192:168:1:20/ inside konqueror, as well as by hostname,
and they all say unknown host or malformed url. I didn't find a
"ftp6" through dselect, are the ftp clients just not v6 compatible?
Lastly, I have a technical question. I addressed the hosts not only
with fef::192:168:1:2 and fef::192:168:1:20 but also ::192.168.1.20
and ::192.168.1.2
====
#ifconfig
eth1 Link encap:Ethernet HWaddr 00:02:8A:94:48:01
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::202:8aff:fe94:4801/64 Scope:Link
inet6 addr: fef::192:168:1:2/120 Scope:Global
inet6 addr: ::192.168.1.2/120 Scope:Compat
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4107404 errors:0 dropped:0 overruns:0 frame:0
TX packets:3082080 errors:4354 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:721410736 (687.9 MiB) TX bytes:404624912 (385.8 MiB)
Interrupt:177 Memory:d4006000-d4006ff
====
Does the "Scope:Compat" confir any automatic functions? Routing, NAT,
v6 to v4 conversions? Is it treated as Global or Local address space?
I notice that even though "fef::" is considered private, its notation
above is "Scope:Global". Or is "Scope:Compat" just notated as
"Compat" for human readability?
Darned Second-System syndrome.
Curt-
---
September 11th, 2001
The proudest day for gun control and central
planning advocates in American history
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