open cmd type in netstat -a -n -o find TCP [the IP address]:[port number] …. #[target_PID]# (ditto for UDP) (Btw, kill [target_PID] didn’t work for me) CTRL+ALT+DELETE and choose “start task manager” Click on “Processes” tab Enable “PID” column by going to: View > Select Columns > Check the box for PID Find the PID … Read more
Something that should be noted here, and that most people overlook completely, is the fact, that the TCP checksum is actually a very poor checksum. The TCP checksum is a 16-bit ones-complement sum of the data. This sum will catch any burst error of 15 bits or less, and all 16-bit burst errors except for … Read more
RFC1700 stated it must be so. (and defined network byte order as big-endian). The convention in the documentation of Internet Protocols is to express numbers in decimal and to picture data in “big-endian” order [COHEN]. That is, fields are described left to right, with the most significant octet on the left and the least significant … Read more
This is one of my favorite questions. UDP is so misunderstood. In situations where you really want to get a simple answer to another server quickly, UDP works best. In general, you want the answer to be in one response packet, and you are prepared to implement your own protocol for reliability or to resend. … Read more
First off, you should be using the Docker embedded DNS server at 127.0.0.11. Your problem could be caused by 1 of the following: nginx is trying to use IPv6 (AAAA record) for the DNS queries. See https://stackoverflow.com/a/35516395/1529493 for the solution. Basically something like: http { resolver 127.0.0.11 ipv6=off; } This is probably no longer a … Read more
I think I’ve finally found the answer, but you’re probably not going to like it. It would appear that the phone emulator requires you to have a second network adapter to dedicate to this purpose. Personally, I run Windows 8 in VMWare, and so a second network adapter is free for me. Anyway, after you … Read more
It is valid inasmuch as it contains four octets, each within the range 0 through 255 inclusive. However, it is not usable as a real IP address. RFC1700 (a) states that 0.0.0.0/8 (0.<anything>.<anything>.<anything>) is reserved as a source address only. You can get into situation where it appears you have this address but that’s normally … Read more
You can accomplish this with IP aliasing on the host. First, add a virtual interface on the host that has a different IP address than the primary interface. We’ll call the primary interface eth0 with IP 10.0.0.10, and the virtual interface eth0:1 with IP address 10.0.0.11. ifconfig eth0:1 10.0.0.11 netmask 255.255.255.0 up Now run the … Read more
Each socket in TIME_WAIT consumes some memory in the kernel, usually somewhat less than an ESTABLISHED socket yet still significant. A sufficiently large number could exhaust kernel memory, or at least degrade performance because that memory could be used for other purposes. TIME_WAIT sockets do not hold open file descriptors (assuming they have been closed … Read more
Connect to a non-routable IP address, such as 10.255.255.1.