[SATLUG] 50/50 ppp connection

Craig sargonemail at gmail.com
Tue Sep 4 11:50:12 CDT 2012


Any thoughts on what might be causing the following weired
internet issues. The connection is through ppp.  It doesn't
doesn't matter what distro used (ubuntu, puppy, slax, suse,
etc..); boot/run type live cd/dvd, usb, hard drive;
hardware (modem card / usb modem / serial port modem)
and ppp versions don't seem to matter either.
This is independent of time of day, connection time length,
machine uptime.
The end result is every other packet sent is silently dropped.
PPP-ing to someone elses house/box shows that they never receive
47% to 52% of the packets sent (and vise versa).
No tcp/ip request to retransmit is issued for any of the dropped/lossed packets.

In the ping example note icmp_req # being skipped.
Ping time is resonable for ppp connection, icmp_req sequence
skipping is not.
The time between icmp_request= (odd_number) && icmp_requests
= (odd_number + 1) is between 8 && 24 seconds.
Icmp_requests may start even or start odd.
Packet loss is always in a range between 47% && 52%

Throw in slow dial-up times && other than an interesting
research issue(s), dial-up is worthless with the above issue.
Any hints/suggestions (other than switch to something other than


Ping example.
machine:>$ ping www.google.com
PING www.l.google.com ( 56(84) bytes of data.
64 bytes from iy-in-f99.1e100.net ( icmp_req=1 ttl=48 time=232 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=3 ttl=48 time=298 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=5 ttl=48 time=252 ms
64 bytes from icmp_req=7 ttl=48 time=212 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=9 ttl=48 time=279 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=11 ttl=48
time=243 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=13 ttl=48
time=190 ms
64 bytes from icmp_req=15 ttl=48 time=207 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=17 ttl=48
time=232 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=19 ttl=48
time=239 ms
64 bytes from iy-in-f99.1e100.net ( icmp_req=21 ttl=48
time=246 ms
^C64 bytes from iy-in-f99.1e100.net ( icmp_req=23
ttl=48 time=292 ms

--- www.l.google.com ping statistics ---
23 packets transmitted, 12 received, 47% packet loss, time 98043ms
rtt min/avg/max/mdev = 190.731/244.018/298.424/31.700 ms

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