packet

I see UDP packets arriving on my Linux box (via tcpdump) with destination port set to 25555. However: nc -l -u 25555 shows no traffic. I've already checked: iptables is off destination MAC address matches the incoming interface destination IP address matches the incoming interface IP checksum is OK UDP checksum is OK Also, all the packets are being dropped, thus it's not a problem with overlowing rx buffers. Any ideas what else may cause the pakcets to be dropped? You have another process on your machine which is reading the datagrams arriving on port 25555. We can see it from your /proc/net

前言 max_allowed_packet mysql根据max_allowed_packet限制server接收数据包的大小, 数据量超过这个限制时会导致写入或更新失败. 查看当前限制 show VARIABLES like '%max_allowed_packet%'; 修改 以下提供两种修改方式 1. 修改配置文件 # 查看配置文件路径 mysql --help | grep my.cnf # 修改 vim /etc/my.cnf 在[mysqld]段增加或修改以下内容: max_allowed_packet = 5M # 重启mysql service mysql restart 2. 命令行修改 # 登录mysql mysql -u root -p # 运行指令 set global max_allowed_packet = 5*1024*1024 # 如果上条命令无效: # set @@max_allowed_packet=5*1024*1024 # 重启mysql service mysql restart # ubuntu service mysqld restart # centos 来源： oschina 链接： https://my.oschina.net/u/2404202/blog/1796364

I came up with a technique a while back which I've been using in multiple projects. It's using a single string to store a list of values. Each value is prefixed with the size of the value, then the deliminator (after size) and then the data - and repeat. Using this technique means that you can store literally any type of character, without trying to exclude the use of a deliminator between the values. Here's a sample of such a string: 23|This is the first value13|Another value5|third That translates to a list of these values: This is the first value Another value third I've learned by testing

I want to send a raw http packet to a webserver and recieve its response but i cant find out a way to do it. im inexperianced with sockets and every link i find uses sockets to send udp packets. any help would be great. Take a look at this simple example from the fsockopen manual page : <?php $fp = fsockopen("www.example.com", 80, $errno, $errstr, 30); if (!$fp) { echo "$errstr ($errno)<br />\n"; } else { $out = "GET / HTTP/1.1\r\n"; $out .= "Host: www.example.com\r\n"; $out .= "Connection: Close\r\n\r\n"; fwrite($fp, $out); while (!feof($fp)) { echo fgets($fp, 128); } fclose($fp); } ?> The

In practice, what is the most appropriate term for the communications transmitted over a network in higher level protocols (those above TCP/IP, for example)? Specifically, I am referring to small, binary units of data. I have seen both "message" and "packet" referred to in various client/server libraries, but I was interested in the community's consensus. These are definitely messages. A "packet" is a layer-3 (in ISO terminology) protocol unit, such as an IP packet; and a "datagram" is a layer-1 or layer-2 unit, such as the several Ethernet datagrams that might make up the fragments of an IP

I'm using UdpClient to query game servers about server name, map, number of players, etc. I've followed the guidelines on this page (A2S_INFO) http://developer.valvesoftware.com/wiki/Server_queries#Source_servers and I'm getting a correct reply: alt text http://data.fuskbugg.se/skalman01/reply.JPG I have no idea how I would go about to get each chunk of information (server name, map and the like). Any help? I'm assuming one would have to look at the reply format specified in the wiki I linked, but I don't know what to make of it. The reply format gives you the order and type of fields in the