How to tell which interface the socket received the message from?
dwc is right, IPV6_PKTINFO will work for IPv6 on Linux. Moreover, IP_PKTINFO will work for IPv4 — you can see details in manpage ip(7)
dwc is right, IPV6_PKTINFO will work for IPv6 on Linux. Moreover, IP_PKTINFO will work for IPv4 — you can see details in manpage ip(7)
Yes, and no. It’s actually do-able, so long as the intervening routers don’t have no ip directed-broadcasts or similar configured. However these days that’s the default because allowing normal broadcasts to traverse routers is a DoS problem. If you really want to broadcast across subnets then you should be using IP Multicast instead. That still … Read more
The interface/API presented to you the user(programmer) of these protocols are: UDP Message oriented, you have an API (send/recv and similar) that provide you with the ability to send one datagram, and receive one datagram. 1 send() call results in 1 datagram sent, and 1 recv() call will recieve exactly 1 datagram. TCP Stream oriented, … Read more
Checkout this wiki, specifically the section Restrictions on valid host names Hostnames are composed of series of labels concatenated with dots, as are all domain names. For example, “en.wikipedia.org” is a hostname. Each label must be between 1 and 63 characters long, and the entire hostname (including the delimiting dots but not a trailing dot) … Read more
As others said your Firewall needs to be configured to accept incoming calls on TCP Port 80. in win 7+ (easy wizardry way) go to windows firewall with advance security Inbound Rules -> Action -> New Rule select Predefined radio button and then select the last item – World Wide Web Services(HTTP) click next and … Read more
Drawbacks of using TCP for live video: As you mentioned, TCP buffers the unacknowledged segments for every client. In some cases this is undesirable, such as TCP streaming for very popular live events: your list of simultaneous clients (and buffering requirements) are large in this case. Pre-recorded video-casts typically don’t have as much of a … Read more
I decided to download the assigned port numbers from IANA, filter out the used ports, and sort each “Unassigned” range in order of most ports available, descending. This did not work, since the csv file has ranges marked as “Unassigned” that overlap other port number reservations. I manually expanded the ranges of assigned port numbers, … Read more
If you’re using Windows it’s not possible – read below. You can use the local address of your machine instead and then you’ll be able to capture stuff. See CaptureSetup/Loopback. Summary: you can capture on the loopback interface on Linux, on various BSDs including Mac OS X, and on Digital/Tru64 UNIX, and you might be … Read more
Pulling the network cable will not break a TCP connection(1) though it will disrupt communications. You can plug the cable back in and once IP connectivity is established, all back-data will move. This is what makes TCP reliable, even on cellular networks. When TCP sends data, it expects an ACK in reply. If none comes … Read more
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