[LINK] IPv4 host density measured by ping
Robin Whittle
rw at firstpr.com.au
Thu Mar 1 11:22:35 AEDT 2007
Howard Lowndes wrote:
> I think your figures are likely to be grossly flawed based on many
> connections being via DSL modems, almost all of which are by default
> configured to not respond to pings.
Can anyone comment on this?
I tried pinging the full range of three /24 prefixes which I know to be
populated by ADSL services:
150.101.162.0/24 Internode 89 acks
ppp162-0.static.internode.on.net etc.
I have a static IP address service on this prefix, so
others may be the same, with the host computer, not
the ADSL modem having the IP address.
59.167.75.0/24 Internode 76 acks
ppp75-246.lns1.mel3.internode.on.net etc.
Jan Whitaker's service is on this prefix. Presumably
these are not static, but are like most ADSL services:
dynamic assignment of IP addresses to various modems
with the modem presumably doing NAT. Therefore it must
be the modem responding to a ping.
203.214.17.0/24 Iinet 145 acks
203-214-17-1.dyn.iinet.net.au etc.
This prefix is definitely for ordinary dynamically
assigned ADSL services, with what used to be OzEmail.
Can anyone with an ADSL service tell me their IP address? I will ping
that /24 subnet.
Cable modems evidently return pings. As I wrote in:
http://www.firstpr.com.au/ip/host-density-per-prefix/
the 24.0.0.0/8 prefix (May01 ARIN - Cable Block) acknowledges pings for
17.62 % of its IP addresses.
- Robin
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