The format and size of the address is usually protocol specific. sockaddr is used as the base of a set of address structures that act like a discriminated union, see the Beej guide to networking. You generally look at the sa_family and then cast to the appropriate address family’s specific address structure. TCP and UDP … Read more
Overview What is causing the inability to send/receive data locally? Mostly buffer space. Imagine sending a constant 10MB/second while only able to consume 5MB/second. The operating system and network stack can’t keep up, so packets are dropped. (This differs from TCP, which provides flow control and re-transmission to handle such a situation.) Even when data … Read more
You’ll have to do a ping sweep. There’s a Ping class in the System.Net namespace. Example follows. Also this is only possible if your computers don’t have firewalls running. If they’ve got a firewall enabled, there’s no way to determine this information short of doing SNMP queries on your switches. System.Net.NetworkInformation.Ping p = new System.Net.NetworkInformation.Ping(); … Read more
I learned IP networking from TCP/IP Illustrated. Highly recommended.
The problem you have is related to TCP streaming nature. The fact that you sent 100 Bytes (for example) from the server doesn’t mean you will read 100 Bytes in the client the first time you read. Maybe the bytes sent from the server arrive in several TCP segments to the client. You need to … Read more
I used ping to calculate bandwidth in local network. I think it’s as accurate as other means of measuring bandwidth (e.g. downloading a big file). You can use it too for your internet connection if you have a symmetric link to the internet (i.e. not adsl). Here’s how I do it: I have a gigabit … Read more
For the error “configure: error: ssl is required but missing” You will need to install libssl-dev. sudo apt-get install libssl-dev For the error “configure: error: lzo enabled but missing” sudo apt-get install liblzo2-dev For the error “configure: error: libpam required but missing “ sudo apt-get install libpam0g-dev
Since Python 3.3 there is an ipaddress module in the stdlib that you can use. >>> import ipaddress >>> ipaddress.ip_address(‘192.168.0.1’).is_private True If using Python 2.6 or higher I would strongly recommend to use a backport of this module.
This can happen if you filled up your socket buffer, but it is highly operating system dependent. Since UDP does not provide any guarantee your operating system can decide to do whatever it wants when your socket buffer is full: block or drop. You can try to increase SO_SNDBUF for temporary relief. This can even … Read more