A small ISP at one of our small cities is claiming a fiber cut took them offline..
I can't buy it that it goes from ATlanta to San Fran in 1 hop....
Trace to www.advi.net
10 12.122.12.50 0ms 10ms 10ms TTL: 0 (ggr1-p380.attga.ip.att.net probable bogus rDNS: No DNS)
11 192.205.32.126 10ms 10ms 0ms TTL: 0 (att-gw.sf.uu.net probable bogus rDNS:
12 Request timed out
We are moving a mail server and got caught...
A small ISP at one of our small cities is claiming a fiber cut took
them offline..
This is NANOG, and this is pretty basic, so this is probably the wrong
forum for this explanation. That said, if a small ISP gets taken off line
by a fiber cut, it's far more likely to be somewhere between the major
backbone and the ISP (a circuit which from the ISP's perspective may be
controlled by the major backbone), than it is that the fiber cut will
actually isolate the major backbone's POP. The major backbones at this
point have a fair amount of redundancy built in, while the circuit from
the major backbone to the ISP is likely to be a single circuit on a single
path.
Still, even in that environment, most circuit outages are not fiber cuts.
I can't buy it that it goes from ATlanta to San Fran in 1 hop....
Trace to www.advi.net
10 12.122.12.50 0ms 10ms 10ms TTL: 0 (ggr1-p380.attga.ip.att.net probable bogus rDNS: No DNS)
11 192.205.32.126 10ms 10ms 0ms TTL: 0 (att-gw.sf.uu.net probable bogus rDNS:
12 Request timed out
Not to mention that they'd have to have discovered faster light. 
-Steve
you didn't get the memo? This is new MCI-Lite! Fast and cooler than the
older stoggier (stoogier?) light.
There are no reliable public statistics concerning outage causes for IP
networks. The FCC and NRIC have a focus group establishing a voluntary
outage reporting process for Cable, IP and Wireless providers. See
http://www.nric.org/
Last quarter 49% of all FCC reported outages were facility failures (cable
cuts and similar outside plant problems). Other sources of outages were
Signalling (21%), CO Power (12%), Local switch (12%) and Tandem switch (6%).