Start installing other firmware on my Linksys router...

I am starting to use "Firmware Version: v3.03.6 - HyperWRT 2.1b1" for my wireless router.

now, I have telnet to it.

========== dmesg output===============
CPU revision is: 00029007
Primary instruction cache 8kb, linesize 16 bytes (2 ways)
Primary data cache 4kb, linesize 16 bytes (2 ways)
Linux version 2.4.20 (root@localhost) (gcc version 3.2.3 with Broadcom modifications) #1 Fri Feb 18 18:25:54 CET 2005
Determined physical RAM map:
memory: 01000000 @ 00000000 (usable)
On node 0 totalpages: 4096
zone(0): 4096 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/mtdblock2 noinitrd console=ttyS0,115200
CPU: BCM4712 rev 1 at 200 MHz
Calibrating delay loop... 199.47 BogoMIPS
Memory: 14444k/16384k available (1333k kernel code, 1940k reserved, 108k data, 64k init, 0k highmem)
Dentry cache hash table entries: 2048 (order: 2, 16384 bytes)
Inode cache hash table entries: 1024 (order: 1, 8192 bytes)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 4096 (order: 2, 16384 bytes)
Checking for 'wait' instruction... unavailable.
POSIX conformance testing by UNIFIX
PCI: Disabled
PCI: Fixing up bus 0
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x1
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0xb8000300 (irq = 3) is a 16550A
ttyS01 at 0xb8000400 (irq = 0) is a 16550A
HDLC line discipline: version $Revision: 1.1.1.4 $, maxframe=4096
N_HDLC line discipline registered.
PPP generic driver version 2.4.2
Physically mapped flash: Found an alias at 0x400000 for the chip at 0x0
Physically mapped flash: Found an alias at 0x800000 for the chip at 0x0
Physically mapped flash: Found an alias at 0xc00000 for the chip at 0x0
Physically mapped flash: Found an alias at 0x1000000 for the chip at 0x0
Physically mapped flash: Found an alias at 0x1400000 for the chip at 0x0
Physically mapped flash: Found an alias at 0x1800000 for the chip at 0x0
Physically mapped flash: Found an alias at 0x1c00000 for the chip at 0x0
number of CFI chips: 1
0: offset=0x0,size=0x2000,blocks=8
1: offset=0x10000,size=0x10000,blocks=63
Flash device: 0x400000 at 0x1c000000
Physically mapped flash: cramfs filesystem found at block 910
Creating 4 MTD partitions on "Physically mapped flash":
0x00000000-0x00040000 : "pmon"
0x00040000-0x003f0000 : "linux"
0x000e3918-0x003f0000 : "rootfs"
mtd: partition "rootfs" doesn't start on an erase block boundary -- force read-only
0x003f0000-0x00400000 : "nvram"
sflash: found no supported devices
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 1024 bind 2048)
Linux IP multicast router 0.06 plus PIM-SM
ip_conntrack version 2.1 (128 buckets, 1024 max) - 344 bytes per conntrack
ip_conntrack_pptp version 1.9 loaded
ip_nat_pptp version 1.5 loaded
ip_tables: (C) 2000-2002 Netfilter core team
ipt_time loading
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
NET4: Ethernet Bridge 008 for NET4.0
802.1Q VLAN Support v1.7 Ben Greear
All bugs added by David S. Miller
VFS: Mounted root (cramfs filesystem) readonly.
Mounted devfs on /dev
Freeing unused kernel memory: 64k freed
5325E phy=0
5325E VLAN programming for BCM5325E-MDIO I/F switch
1:(0x00) value=0x8000
2:(0x00) value=0x8000
1:(0x13) value=0x0000
2:(0x13) value=0x0002
1:(0x00) value=0x8000
2:(0x00) value=0x8000
1:(0x13) value=0x0002
2:(0x13) value=0x0006
1:(0x00) value=0x8000
2:(0x00) value=0x8000
1:(0x13) value=0x0006
2:(0x13) value=0x000e
1:(0x00) value=0x8000
2:(0x00) value=0x8000
1:(0x13) value=0x000e
2:(0x13) value=0x001e
1:(0x00) value=0x8000
2:(0x00) value=0x0000
eth0: Broadcom BCM47xx 10/100 Mbps Ethernet Controller 3.60.13.0
eth1: Broadcom BCM4320 802.11 Wireless Controller 3.60.13.0
flag=[get_flash] offset=[0] string=[]
Intel 28F320C3 2Mx16 BotB
Set flash_type=Intel 28F320C3 2Mx16 BotB
exit
Algorithmics/MIPS FPU Emulator v1.5
vlan0: add 01:00:5e:00:00:01 mcast address to master interface
vlan0: dev_set_promiscuity(master, 1)
device eth0 entered promiscuous mode
device vlan0 entered promiscuous mode
device eth1 entered promiscuous mode
br0: port 2(eth1) entering learning state
br0: port 1(vlan0) entering learning state
br0: port 2(eth1) entering forwarding state
br0: topology change detected, propagating
br0: port 1(vlan0) entering forwarding state
br0: topology change detected, propagating
flag=[get_eou_key_index] offset=[0] string=[]
eou_key_init()
location = [1]
Available eou key index is 1
exit
vlan1: Setting MAC address to xxxxxxxxxxxxxxx.
nvram_commit(): init
nvram_commit(): end
nvram_commit(): init
nvram_commit(): end
br0: port 2(eth1) entering disabled state
br0: port 1(vlan0) entering disabled state
vlan0: del 01:00:5e:00:00:01 mcast address from master interface
vlan0: del 01:00:5e:00:00:01 mcast address from vlan interface
br0: port 1(vlan0) entering disabled state
device vlan0 left promiscuous mode
br0: port 2(eth1) entering disabled state
device eth1 left promiscuous mode
vlan0: dev_set_promiscuity(master, -1)
device eth0 left promiscuous mode
vlan0: add 01:00:5e:00:00:01 mcast address to master interface
vlan0: dev_set_promiscuity(master, 1)
device eth0 entered promiscuous mode
device vlan0 entered promiscuous mode
device eth1 entered promiscuous mode
br0: port 2(eth1) entering learning state
br0: port 1(vlan0) entering learning state
br0: port 2(eth1) entering forwarding state
br0: topology change detected, propagating
br0: port 1(vlan0) entering forwarding state
br0: topology change detected, propagating
flag=[get_eou_key_index] offset=[0] string=[]
eou_key_init()
location = [1]
Available eou key index is 1
exit

Flavio’s TechnoTalk � Blog Archive � Performance analysis on Linux

Flavio’s Performance analysis on Linux: "Performance analysis on Linux"

This article gives an overview of performance analysis on Linux.

Wireless USB adapter...

After doing some research, the following USB adapter seems to be working in Linux:

Buffalo WLI-U2-KG54-AI HK$ 270
Surecom EP-9001-G HK$ 210 [RT2500 chipset]
Dlink DWL-G122 HK$ 220 [RT2500 chipset]
Zyxel G220 HK$ 239

EP-9001-GP $328
DWL-G132 $349

I have forgotten the formula for converting mW to dBm, learnt from wireless communication course.
I found a website which provides quite good tools to do the calculation:
Wireless Javascript Toolkit

Need to compare the output power and antenna gain...

slower

常用的数据库连接写法和下载地址(转载)

在调试Spring+hibernate中,后来发现好像Sqlserver的驱动有问题,又听说jtds是非常好的替代品,就在网上照jtds的下载,发现了这篇文章,转载如下(http://dev2dev.bea.com.cn/bbs/thread.jspa?forumID=123&threadID=20222&messageID=116981):

1. MySQL(http://www.mysql.com)mm.mysql-2.0.2-bin.jar
Class.forName( "org.gjt.mm.mysql.Driver" );
cn = DriverManager.getConnection( "jdbc:mysql://MyDbComputerNameOrIP:3306/myDatabaseName", sUsr, sPwd );

2. PostgreSQL(http://www.de.postgresql.org)pgjdbc2.jar
Class.forName( "org.postgresql.Driver" );
cn = DriverManager.getConnection( "jdbc:postgresql://MyDbComputerNameOrIP/myDatabaseName", sUsr, sPwd );

3. Oracle(http://www.oracle.com/ip/deploy/database/oracle9i/)classes12.zip
Class.forName( "oracle.jdbc.driver.OracleDriver" );
cn = DriverManager.getConnection( "jdbc:oracle:thin:@MyDbComputerNameOrIP:1521:ORCL", sUsr, sPwd );

4. Sybase(http://jtds.sourceforge.net)jconn2.jar
Class.forName( "com.sybase.jdbc2.jdbc.SybDriver" );
cn = DriverManager.getConnection( "jdbc:sybase:Tds:MyDbComputerNameOrIP:2638", sUsr, sPwd );
//(Default-Username/Password: "dba"/"sql")

5. Microsoft SQLServer(http://jtds.sourceforge.net)
Class.forName( "net.sourceforge.jtds.jdbc.Driver" );
cn = DriverManager.getConnection( "jdbc:jtds:sqlserver://MyDbComputerNameOrIP:1433/master", sUsr, sPwd );

6. Microsoft SQLServer(http://www.microsoft.com)
Class.forName( "com.microsoft.jdbc.sqlserver.SQLServerDriver" );
cn = DriverManager.getConnection( "jdbc:microsoft:sqlserver://MyDbComputerNameOrIP:1433;databaseName=master", sUsr, sPwd );

7. ODBC
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
Connection cn = DriverManager.getConnection( "jdbc:odbc:" + sDsn, sUsr, sPwd );

8.DB2(新添加)
Class.forName("com.ibm.db2.jdbc.net.DB2Driver");
String url="jdbc:db2://192.9.200.108:6789/SAMPLE"
cn = DriverManager.getConnection( url, sUsr, sPwd );

9.Microsoft SQL Server series (6.5, 7.x and 2000) and Sybase 10

JDBC Name: jTDS
URL: http://jtds.sourceforge.net/
Version: 0.5.1
Download URL: http://sourceforge.net/project/showfiles.php?group_id=33291

语法:
Class.forName("net.sourceforge.jtds.jdbc.Driver ");
Connection con = DriverManager.getConnection("jdbc:jtds:sqlserver://host:port/database","user","password");
or
Connection con = DriverManager.getConnection("jdbc:jtds:sybase://host:port/database","user","password");

10.Postgresql
JDBC Name: PostgreSQL JDBC
URL: http://jdbc.postgresql.org/
Version: 7.3.3 build 110
Download URL: http://jdbc.postgresql.org/download.html
语法:
Class.forName("org.postgresql.Driver");
Connection con=DriverManager.getConnection("jdbc:postgresql://host:port/database","user","password");

11.IBM AS400主机在用的JDBC语法
有装V4R4以上版本的Client Access Express
可以在C:\Program Files\IBM\Client Access\jt400\lib
找到 driver 档案 jt400.zip，并更改扩展名成为 jt400.jar
语法:
java.sql.DriverManager.registerDriver (new com.ibm.as400.access.AS400JDBCDriver ());
Class.forName("com.ibm.as400.access.AS400JDBCConnection");
con = DriverManager.getConnection("jdbc:as400://IP","user","password");

12.informix
Class.forName("com.informix.jdbc.IfxDriver").newInstance();
String url =
"jdbc:informix-sqli://123.45.67.89:1533/testDB:INFORMIXSERVER=myserver;
user=testuser;password=testpassword";
Lib：jdbcdrv.zip

Class.forName( "com.sybase.jdbc.SybDriver" )
url="jdbc:sybase:Tds:127.0.0.1:2638/asademo";
SybConnection connection= (SybConnection)DriverManager.getConnection(url,"dba","sql");

13.SAP DB
Class.forName ("com.sap.dbtech.jdbc.DriverSapDB");
java.sql.Connection connection = java.sql.DriverManager.getConnection ( "jdbc:sapdb://" + host + "/" + database_name,user_name, password)

14.InterBase
String url = "jdbc:interbase://localhost/e:/testbed/database/employee.gdb";
Class.forName("interbase.interclient.Driver");
//Driver d = new interbase.interclient.Driver (); /* this will also work if you do not want the line above */
Connection conn = DriverManager.getConnection( url, "sysdba", "masterkey" );

15.HSqlDB
url: http://hsqldb.sourceforge.net/
driver: org.hsqldb.jdbcDriver
连接方式有4种，分别为：
con-str（内存）: jdbc:hsqldb.
con-str（本地）: jdbc:hsqldb:/path/to/the/db/dir
con-str（http）: jdbc:hsqldb:http://dbsrv
con-str（hsql）: jdbc:hsqldb:hsql://dbsrv