networking

What is “anycast” and how is it helpful?

Anycast is networking technique where the same IP prefix is advertised from multiple locations. The network then decides which location to route a user request to, based on routing protocol costs and possibly the ‘health’ of the advertising servers. There are several benefits to anycast. First, in steady state, users of an anycast service (DNS … Read more

How do I make a connection private on Windows Server 2012 R2

Powershell. Here is an example of changing the network profile of a network interface called Ethernet1 from whatever it is now to “Private.” I got this info from Get-Help Set-NetConnectionProfile -Full. PS C:\>$Profile = Get-NetConnectionProfile -InterfaceAlias Ethernet1 PS C:\>$Profile.NetworkCategory = “Private” PS C:\>Set-NetConnectionProfile -InputObject $Profile Documentation: https://docs.microsoft.com/en-us/powershell/module/netconnection/set-netconnectionprofile?view=winserver2012r2-ps

ssh tunnel refusing connections with “channel 2: open failed”

Problem solved: $ ssh -L 7000:127.0.0.1:7000 user@host -N -v -v …apparently, ‘localhost‘ was not liked by the remote host. Yet, remote /etc/hosts contains: ::1 localhost localhost. 127.0.0.1 localhost localhost. while the local network interface is lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 33184 inet 127.0.0.1 netmask 0xff000000 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 Sigh. so … Read more

Is X.Y.Z.0 a valid IP address?

It depends on the subnet of the IP address in question. In general, the first and last addresses in a subnet are used as the network identifier and broadcast address, respectively. All other addresses in the subnet can be assigned to hosts on that subnet. For example, IP addresses of networks with subnet masks of … Read more

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