This is the complaint that I just mailed the nodal customer care officer for the NCR.
If anyone is experiencing this problem (low bandwidth combined with very fast
blinking of the data transfer lights on the "modem") can they confirm this problem exists?
Dear Mr. Sarma,
My name is Aniruddha Shankar and I am a DSL customer of Airtel with
phone number 4280xxxx. My customer ID is 11xxxxxx. I connect to the
Internet using a Beetel 220BX ADSL "modem", which I use in bridged
mode (PPP over Ethernet (PPPoE) ). My plan is the 256kilobit/sec
unlimited usage one, in which I pay a flat rate per month regardless
of data download or time spent online.
In the last month or so, I have been experiencing a strange problem.
My speed, which used to be very good sometimes drops drastically. When
this happens, my modem's data and pc/usb lights as well as the
computer's LAN card light start blinking together extremely fast. I
just checked my speed at your speed test in
http://speed.touchtelindia.net/meter.php and the speed given is 54.10
kilobit/sec.
I am a network engineer with 9 years of experience with TCP/IP
networks, specialising in LINUX/UNIX networks, and therefore I decided
to try and investigate this problem.
I decided to view and capture the data packets that were causing the
modem lights and my LAN card light to blink so fast. To use this I
used an industry-standard packet capture tool, Wireshark (formely
Ethereal). To summarise my findings, it seems that packets meant for
another IP address are wrongly being received by my machine. Of
course, I am not familiar with your internal network architecture, but
a possible cause for this might be a malfunctioning DSLAM that is
either not functioning in switched mode or is not isolating ports
properly. Technical details are appended. As you will appreciate, this
is a matter that cannot be resolved by call centre executives and I
would appreciate it if you would forward this matter to your network
operations engineers and put me in touch with them. I would be glad to
communicate with them on this matter and test any solutions that they
might have.
Best regards,
Aniruddha Shankar
TECHNICAL DETAILS
-------------------------------
I captured traffic for a mere 2.7 seconds, generating a 3MB capture
log file. This capture file is available at
http://191a.net/20061029.pcap . This file is in the standard
tcpdump/libpcap format and can be read by Wireshark, which is
available at http://www.wireshark.org/download.html . Despite
absolutely no network traffic from my end, packets were being received
at a rate of approximately 100 packets/sec. They seem to be packets
from a wide range of IP addresses that have the destination
203.101.7.61, which resolved to
dsl.delhi.061.7.101.203.touchtelindia.net. At this time, my own IP
address was 203.101.13.XXX. It might be significant that no packets
with the source 203.101.7.61 were seen during the time.
If anyone is experiencing this problem (low bandwidth combined with very fast
blinking of the data transfer lights on the "modem") can they confirm this problem exists?
Dear Mr. Sarma,
My name is Aniruddha Shankar and I am a DSL customer of Airtel with
phone number 4280xxxx. My customer ID is 11xxxxxx. I connect to the
Internet using a Beetel 220BX ADSL "modem", which I use in bridged
mode (PPP over Ethernet (PPPoE) ). My plan is the 256kilobit/sec
unlimited usage one, in which I pay a flat rate per month regardless
of data download or time spent online.
In the last month or so, I have been experiencing a strange problem.
My speed, which used to be very good sometimes drops drastically. When
this happens, my modem's data and pc/usb lights as well as the
computer's LAN card light start blinking together extremely fast. I
just checked my speed at your speed test in
http://speed.touchtelindia.net/meter.php and the speed given is 54.10
kilobit/sec.
I am a network engineer with 9 years of experience with TCP/IP
networks, specialising in LINUX/UNIX networks, and therefore I decided
to try and investigate this problem.
I decided to view and capture the data packets that were causing the
modem lights and my LAN card light to blink so fast. To use this I
used an industry-standard packet capture tool, Wireshark (formely
Ethereal). To summarise my findings, it seems that packets meant for
another IP address are wrongly being received by my machine. Of
course, I am not familiar with your internal network architecture, but
a possible cause for this might be a malfunctioning DSLAM that is
either not functioning in switched mode or is not isolating ports
properly. Technical details are appended. As you will appreciate, this
is a matter that cannot be resolved by call centre executives and I
would appreciate it if you would forward this matter to your network
operations engineers and put me in touch with them. I would be glad to
communicate with them on this matter and test any solutions that they
might have.
Best regards,
Aniruddha Shankar
TECHNICAL DETAILS
-------------------------------
I captured traffic for a mere 2.7 seconds, generating a 3MB capture
log file. This capture file is available at
http://191a.net/20061029.pcap . This file is in the standard
tcpdump/libpcap format and can be read by Wireshark, which is
available at http://www.wireshark.org/download.html . Despite
absolutely no network traffic from my end, packets were being received
at a rate of approximately 100 packets/sec. They seem to be packets
from a wide range of IP addresses that have the destination
203.101.7.61, which resolved to
dsl.delhi.061.7.101.203.touchtelindia.net. At this time, my own IP
address was 203.101.13.XXX. It might be significant that no packets
with the source 203.101.7.61 were seen during the time.
