How many anycast ips can be created per /24 net?
Florian asked: How many anycast ips can I create with one ipv4 /24 net? I know I need a whole /24 net to do anycast, but how many of those …
Why would I pick IPv4 or IPv6 for SSH access?
Moshe asked: I’m setting up a Linode server and the Getting Started security guide suggests disabling ssh access over either IPv4 or IPv6 so that I only have one of …
Prefer IPv4 incoming connections over IPv6
Dan Dascalescu asked: We run a social/local service that benefits from geolocating the IP of users. The problem is that with IPv6, geolocation is quite a bit spottier than with …
American Users have wrong IP address geolocation
fpg1503 asked: In order to display the right content for my users I get their country based on their IP address. I have been receiving several reports from American users …
Windows translate external IPv6 to localhost IPv4
hammereditor asked: I have a machine running Windows server 2012, whose external IPv6 address is “2a01:4f8:190:7449::4”. Let’s assume it has no external IPv4 address, so the v6 address is the …
Do you need separate IPv4 and IPv6 listen directives in nginx?
Synchro asked: I’ve seen various config examples for handling dual-stack IPv4 and IPv6 virtual hosts on nginx. Many suggest this pattern: listen 80; listen [::]:80 ipv6only=on; As far as I …
Logging the outgoing port for IPV4
Draconar asked: I need to become an IPV4 and IPV6 expert in a couple of hours. Our company is being bullied by the internet legislator in our country to move …
Why doesn't this IPv6 listen directive also accept IPv4?
lwood asked: In my nginx (1.4.2) setup on Ubuntu 12.04, I have set up only one configuration file (I deleted/disabled the others): server { listen [::]:80 default_server; location / { …
How to do dual stack IPv4/IPv6 with virtual hosts on nginx 1.4
burnersk asked: I’m using nginx 1.4.1 (now, before it was 1.2.1) and would like to support dual stack (IPv4 and IPv6). I’m always getting duplicate listen options for xyz errors …
ipv6 on Ubuntu server – how do I secure?
csi asked: On our Ubuntu server, ipv4 & ipv6 are enabled. We have taken these steps so far. Enabled iptables & ip6tables Copied the rules exactly from our iptables to …