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RFC 1918 -- was: Re: [K12OSN] Gconfd trouble on new install



On Wed, 12 Jun 2002 jam McQuil com wrote:

> As for the 'NON-ROUTABLE', all of these addresses are fully
> routable.  The real issue is that the 10.0.0.0 and the 192.168.0.0
> networks are "PRIVATE".  that is, they will NEVER be allocated
> to anybody, so they won't end up in the core routers on the
> internet, therefore, those packets won't get routed on the
> internet.

Don't overstate the case.  RFC 1918 _suggests_ behavior which 
an RFC compliant and suggested behaviour following sysadmin 
will follow.  Only IANA will NEVER allocate them publicly.

   http://www.isi.edu/in-notes/rfc1918.txt

It is not at all uncommon to find 'leaks' at the borders by 
RFC ignorant administrators.  

Similarly, the converse case is true as well;  good practice
it to conserve IP space, and to use only whan one 'owns'; the
penalty is mysterious routing errors and a need to do custom
routing.  I often see private internal networks which choose
to use IP ranges which are externally assigned to some one
else.  They still use it in their internal network.  I have
sanitized some other details.

These shots are taken from a private vendor, known here as
xyz, which ran an advert about herding cats a couple
Superbowl's ago;  It was formerly owned by GM, and before that
a little guy from Texas.  The destination IP's and all
intermediate hops are wholly within a private internal
network; the first three lines are the bogus routes I had to
add:

[root dell4 root]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
204.104.54.220  10.10.10.35     255.255.255.255 UGH   0      0        0 eth0
204.230.57.20   10.10.10.35     255.255.255.255 UGH   0      0        0 eth0
204.104.97.71   10.10.10.35     255.255.255.255 UGH   0      0        0 eth0
nn.mm.oo.0      0.0.0.0         255.255.255.0   U     0      0        0 eth4
10.10.10.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.10.11.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.30.0.0       10.10.10.36     255.255.0.0     UG    0      0        0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         nn.mm.oo.1      0.0.0.0         UG    0      0        0 eth4
[root dell4 root]# traceroute 204.104.54.220
traceroute to 204.104.54.220 (204.104.54.220), 30 hops max, 38 byte packets
 1  xyz.inside.lan. (10.10.10.35)  1.647 ms  1.582 ms  1.801 ms
 2  199.228.182.1 (199.228.182.1)  5.418 ms  5.341 ms  5.627 ms
 3  199.228.133.129 (199.228.133.129)  46.605 ms  45.485 ms  45.941 ms
 4  199.228.183.113 (199.228.183.113)  46.325 ms  46.260 ms  46.839 ms
 5  199.228.183.226 (199.228.183.226)  67.402 ms  67.926 ms  67.858 ms
 6  199.228.183.242 (199.228.183.242)  70.926 ms  73.034 ms  68.923 ms
 7  204.104.54.220 (204.104.54.220)  69.376 ms  70.431 ms  69.436 ms
[root dell4 root]# traceroute 204.104.97.71
traceroute to 204.104.97.71 (204.104.97.71), 30 hops max, 38 byte packets
 1  xyz.inside.lan. (10.10.10.35)  1.672 ms  1.593 ms  1.815 ms
 2  199.228.182.1 (199.228.182.1)  5.550 ms  5.434 ms  5.539 ms
 3  199.228.133.129 (199.228.133.129)  49.274 ms  44.823 ms  44.843 ms
 4  199.228.183.113 (199.228.183.113)  46.386 ms  48.810 ms  47.272 ms
 5  144.10.3.77 (144.10.3.77)  46.730 ms  47.143 ms  47.782 ms
 6  144.10.1.115 (144.10.1.115)  46.827 ms  46.877 ms  47.778 ms
 7  144.10.12.21 (144.10.12.21)  47.445 ms  47.391 ms  47.791 ms
 8  204.104.97.71 (204.104.97.71)  49.777 ms  51.897 ms  48.762 ms
[root dell4 root]#

-- Russ herrold





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