48Mbps yet 66 SNR with 802.11g clients

i have been monitoring my wireless connection around the house trying to get a feel for signal strength using netstumbler and am baffled why my WRT100 only shows 48Mbps when it should be 54Mbps.
the signal noise ratio is 66 which seems really good.
my router (wrt100) is configure for default, i have changed nothing except to setup security on the device.
and i have 802.11g cards on the workstations.

1. How do you run Netstumbler on the WRT?
2. Forget about the "speed" the wireless driver in your computer shows you. It is pretty much irrelevant. The number shown is some mathematical function related to the signal strength of the beacon signal received. There are more implementations for this function then you can think off. Everyone does it differently.
You only know how fast you can transfer if you move really data through the channel. A 54 Mbit/s shown won't help you if 10 other access points close by fill up the same channel.
A 48 Mbit/s or less shown won't bother you if you are in an environment with no interference and once you start moving some data you get optimum rates.
If you want to know which data rate you have at some place at some time transfer data, e.g. copy some larger files from a computer wired to the router to a wireless computer. Make sure the wireless computer is on AC to prevent power saving settings interfering with performance.

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    TCP/IP NT Protocol Adapter for Solaris: Version 11.1.0.6.0 - Production
    Time: 07-JUL-2011 05:48:50
    Tracing to file: /scratch/sgarg/wrk/bug/OE00175173/oe102b/64bit/trace/cli_8585
    .trc
    Tns error struct:
    ns main err code: 12533
    TNS-12533: TNS:illegal ADDRESS parameters
    ns secondary err code: 0
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0
    Following is my test environment
    Platform and OS - Solaris 2.9 SPARC V9
    Oracle client version - 11.1.0.6.0
    Oracle Server version - 11.1.0.6.0
    On Database server which is running on 64 bit Windows, listener log and listener trace have following error logs
    listenr.log:
    TNS-12502: TNS:listener received no CONNECT_DATA from client.
    Following is the header of the listener.log file
    TNSLSNR for 64-bit Windows: Version 11.1.0.6.0 - Production on 07-JUL-2011 09:04:56
    listener.trc:
    The corresponding listner trace has following trace entry
    [07-JUL-2011 11:51:51:668] ntt2err: Read unexpected EOF ERROR on 460
    The Oracle client (version 11.1.0.6.0) is running on Solrias 64 bit machine.
    Please help me understanding why are these errors appearing with Oracle 11g client.
    Regards,
    Sachin

    Hi,
    Thanks for your reply, but your assumption is incorrect that I did not read the error message in the documentation. I read it many times, but could not correlate it with any wrongdoing.
    solaris64:102b$ oerr TNS 12533
    12533, 00000, "TNS:illegal ADDRESS parameters"
    // *Cause: An illegal set of protocol adapter parameters was specified. In
    // some cases, this error is returned when a connection cannot be made to the
    // protocol transport.
    // *Action: Verify that the destination can be reached using the specified
    // protocol. Check the parameters within the ADDRESS section of
    // TNSNAMES.ORA. Legal ADDRESS parameter formats may be found in the
    // Oracle operating system specific documentation for your platform.
    // Protocols that resolve names at the transport layer (such as DECnet object
    // names) are vulnerable to this error if not properly configured or names are
    // misspelled.
    The above says that, illegal set of protocol adapters was specified...., I am using 'Local Naming (tnsnames.ora)' connection method and using TCP/IP protocol.
    Following are the tnsnames.ora content
    solaris64:102b$ cat tnsnames.ora
    oeora11g1 =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = vm-oedsdev1)(PORT = 1521))
    (CONNECT_DATA =
    (service_name = orcl)
    and the following are the sqlnet.ora content
    solaris64:102b$ cat sqlnet.ora
    # sqlnet.ora Network Configuration File: /gateways/solaris64/oracle/client/10.2/network/admin/sqlnet.ora
    # Generated by Oracle configuration tools.
    NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES)
    DIAG_ADR_ENABLED=NO
    trace_level_client=SUPPORT
    trace_directory_client=/scratch/sgarg/wrk/bug/OE00175173/oe102b/64bit/trace
    My bad that the information was not enough to comment on anything on the problem.
    I think, the above info would be helpful
    Thanks,
    Sachin

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