tomtom 1500

: BB: d1Inet ADDR: 192.168.21.199 bcast: 192.168.21.255 mask: 255.255.255.0Inet6 ADDR: fe80: 202: 72ff: fe77: bbd1/64 scope: LinkUp broadcast running Multicast MTU: 1500 Metric: 1RX packets: 3246 errors: 0 dropped: 0 overruns: 0 frame: 0TX packets: 1947 errors: 0 dropped: 0 overruns: 0 carrier: 0Collisions: 0 FIG: 1000RX Bytes: 4514869 (4.3 MIB) TX Bytes: 177732 (173.5 kib)Wlan0 indicates the first wireless Ethernet CardLink encap indicates the name o

There may be very few Reyou that have noticed the impact of the "MTU" value of the "native, network" on their own network performance. For faster download speeds, the MTU value is set incorrectly, as if running in high heels.What is the MTU?"Mtu= Maximum Transmission Unit unit: bytes"The various network operations that we do when we use the Internet are implemented through a "packet" transfer. The MTU specifies the maximum size of the packets that can be transmitted in the network, and in our us

MTU is the abbreviation of MaximumTransmissionUnit, which is the largest data packet transmitted over the network. MTU of most network devices is 1500, and MTU is measured in bytes. If the MTU of the local machine is larger than the MTU of the gateway, large data packets will be split and transmitted, which will produce a lot of data packet fragments, increase the packet loss rate and reduce the network speed. Setting the MTU of the local machine to

Why is there a limit to the minimum frame length and maximum frame length in traditional Ethernet?Ethernet (IEEE 802.3) frame format:1, Preamble code: 7 byte 0x55, a string of 1, 0 interval, for signal synchronization2, Frame starting delimiter: 1 bytes 0xd5 (10101011), indicating the beginning of a frame3. DA (Destination mac): 6 bytes4, SA (Source mac): 6 bytes5, type/Length: 2 bytes, 0~1500 reserved as Length field value, 1536~65535 reserved as Ty

December 12 22:08 \/Sys/bus/pci/drivers/8139too/64360 lrwxrwxrwx 1 root root0 December 12 22:08 \/Sys/bus/pci/drivers/8139too/0000: 00: 0e. 0-> .. /.. /.. /.. /devices/pci0000: 00/0000: 00: 0e. 064850 lrwxrwxrwx 1 root root0 December 12 22:08 \/Sys/bus/pci/drivers/8139too/module->.../module/8139too64880 -- w ------- 1 root 4096 December 12 22:08 \/Sys/bus/pci/drivers/8139too/uevent64890 -- w ------- 1 root 4096 December 12 22:08 \/Sys/bus/pci/drivers/8139too/unbind64900 -- w ------- 1 root 4096

Sequence Number functions provided by Oracle Take the EMP table as an example:1: rownum is the simplest sequence number, but the value is determined before order.Select rownum, T. * from EMP t order by enameRow rownum empno ename job Mgr hiredate Sal comm deptno1 11 7876 Adams clerk 7788 1987-5-23 1100 202 2 7499 Allen salesman 7698 1981-2-20 1600 300 303 6 7698 Blake manager 7839 1981-5-1 2850 304 7 7782 Clark manager 7839 1981-6-9 2450 105 13 7902 Ford analyst 7566 1981-12-3 3000 206 12 7900

Reposted for study 1,Data Link LayerThere is a limit on the length of the data frame, that is, the maximum data length that the link layer can bear. This value is called the maximum transmission unit (MTU. Taking Ethernet as an example, this value is usually 1500 bytes. 2. for IP packets, there is also a length. In the IP packet header, the length of the IP packet is described in 16 bits, that is, an IP packet, the maximum value may be 65535 bytes (mo

the characteristics of LAN, but it is not completely equivalent to the LAN protocol, so there is still room for optimization. We can use software to modify the relevant parameters in the Registry to optimize the system for ADSL. Specific parameters include MaxMTU and DefaultRcvWindow. This optimization can adapt ADSL to ISP network parameters and maximize the efficiency of ADSL. MTU is the abbreviation of Maximum Transmission Unit, which indicates the 'maximum Transmission Unit ', that is, the

Frontend main_status -- Define acl rules Bind 0.0.0.0: 80 -- bind to port 80 Mode http Log global Option httplog Option forwardfor Acl web1 hdr_reg (host)-I ^ (www.itnihao.cn | ww1.itnihao.cn) $ -- Match www.itnihao.cn and ww1.itnihao.cn and put them in the web1 variable. Acl web2 url_sub-I killall = -- put the request containing killall = into the web2 variable. Acl web3 path_beg-I/static/images/javascript/stylesheets Use_backend server_web3 if web3 -- if the web3 variable is met, it will be

indicates the month (1, 2,..., 12)The year in the format of % Y.The year in double-digit % y format.% Direct value "%" (6 ):datediff(date1,date2)Calculate the number of days for the difference between two dates SELECT datediff('2015-8-8',now()) #654IV. Process control (1 ):if(value,t,f)If the value is true, t is returned; otherwise, f is returned. Mysql> SELECT if (salary> 1500, 'high', 'Low') FROM salary; + ------------------------- + | if (salary>

following parameters: -O max_connections = 1500 The specific point is the following position: Special instructions in red letters: www.bitsCN.com Then $ NOHUP_NICENESS $ ledir/$ MYSQLD $ Defaults -- basedir = $ MY_BASEDIR_VERSION -- Datadir = $ DATADIR $ USER_OPTION -- Pid-file = $ pid_file -- Skip-external-locking -O max_connections = 1500 >>$ Err_log 2> 1 else Eval "$ NOHUP_NICENES

4.4 as an example: Vi/usr/local/MySQL/bin/mysqld_safe Find safe_MySQLd and edit it. find the two lines started by mysqld and add the following parameters: -O max_connections = 1500 The specific point is the following position: Note in red: Then $ NOHUP_NICENESS $ ledir/$ MySQLD $ Defaults -- basedir = $ MY_BASEDIR_VERSION -- Datadir = $ DATADIR $ USER_OPTION -- Pid-file = $ pid_file -- Skip-external-locking -O max_connections =

How to modify the default connections of MySQL5.0 in Linux bitsCN.com during this time, the server crashed twice and no reason was found. today, I saw an error message email from the forum, I think of the problem that may be caused by the default number of connections in mysql. check it out. my god, the default number of connections is only 100. how can this problem be solved? I found some information on the Internet for a long time and said I had to modify my. for cnf, it is said to modify safe

. find the two lines started by mysqld and add the following parameters: -O max_connections = 1500 The specific point is the following position: Note in red: Then $ NOHUP_NICENESS $ ledir/$ MYSQLD $ Defaults -- basedir = $ MY_BASEDIR_VERSION -- Datadir = $ DATADIR $ USER_OPTION -- Pid-file = $ pid_file -- Skip-external-locking -O max_connections = 1500 >>$ Err_log 2> 1 else Eval "$ NOHUP_NICENESS $ ledir/$

network stop // stop a network service Service network restart // restart the network service Service network status // view the network service status Ifconfig eth0 192.168.10.222 netmask 255.255.255.0 // temporarily modify the interface IP address (no need to restart the interface) [Yeger @ yeger ~] $ Sudo ifconfig wlan0 192.168.21.199 netmask 255.255.255.0 [Yeger @ yeger ~] $ Ifconfig wlan0 Wlan0 Link encap: Ethernet HWaddr 00: 02: 72: 77: BB: D1 Inet addr: 192.168.21.199 Bcast: 192.168.21