Ran a Network Diagnostic Test [NDT] on Airtel broadband to determine
* The slowest link in the end-to-end path (Dial-up modem to 10 Gbps Ethernet/OC-192)
* The Ethernet duplex setting (full or half);
* If congestion is limiting end-to-end throughput.

..and the results are as follows....

TCP/Web100 Network Diagnostic Tool v5.5.1
click START to begin
Connected to: nettest.lbl.gov -- Using IPv4 address
Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
checking for firewalls . . . . . . . . . . . . . . . . . . . Done
running 10s outbound test (client-to-server [C2S]) . . . . . 271.0kb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 383.40kb/s
Your PC is connected to a Cable/DSL modem
[S2C]: Packet queuing detected

WEB100 Enabled Statistics:
Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
checking for firewalls . . . . . . . . . . . . . . . . . . . Done
running 10s outbound test (client-to-server [C2S]) . . . . . 271.0kb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 383.40kb/s

------ Client System Details ------
OS data: Name = Windows XP, Architecture = x86, Version = 5.1
Java data: Vendor = Sun Microsystems Inc., Version = 1.6.0_11

------ Web100 Detailed Analysis ------
Cable modem/DSL/T1 link found.
Link set to Full Duplex mode
No network congestion discovered.
Good network cable(s) found
Normal duplex operation found.

Web100 reports the Round trip time = 491.35 msec; the Packet size = 1452 Bytes; and
There were 48 packets retransmitted, 97 duplicate acks received, and 120 SACK blocks received
The connection was idle 0 seconds (0%) of the time
C2S throughput test: Packet queuing detected: 2.77%
S2C throughput test: Packet queuing detected: 93.60%
This connection is receiver limited 10.44% of the time.
Increasing the the client's receive buffer (62.0 KB) will improve performance
This connection is network limited 88.66% of the time.

Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: OFF

Server 'nettest.lbl.gov' is not behind a firewall. [Connection to the ephemeral port was successful]
Client is probably behind a firewall. [Connection to the ephemeral port failed]
Information: Network Middlebox is modifying MSS variable
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address [my comment - because i am behind a router]
Server says [122.167.80.161] but Client says [192.168.1.9]