Regex is cool. But have you ever tried to grep IPv4 / IPv6 Adresses from a File or extract from a bunch of data ? Did you use Google Search and found lot of Links, Tip’s and Examples ? And non of them worked well ? I can highly recommend CyberChef for stuff like that … https://gchq.github.io/CyberChef/ Regex from CyberChef If you wanna use Regex in your own Scripts, here is a little Extract from Cyberchef.
… or how to host a Dualstacked Public Website behind a IPv4 NAT Box without Reverse Proxy, Portforwarding and other ugly stuff … inspired by the following Post, i started a little project and redesigned the connectifity for my Hamster’s Webserver :) i wrote a mail to the guys from tetaneutral.net and asked them for the wireguard vpn service with public ipv4/ipv6 adresses for my server. as i didn’t get any feedback, i had to implement the “Server” on my own.
https://serverfault.com/questions/142344/how-to-test-dns-glue-record Check GlueRecords host:~ $ dig +short ch. NS c.nic.ch. a.nic.ch. h.nic.ch. f.nic.ch. g.nic.ch. b.nic.ch. e.nic.ch. host:~ $ dig +norec @a.nic.ch. noflow.ch. NS ; <<>> DiG 9.10.6 <<>> +norec @a.nic.ch. noflow.ch. NS ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29211 ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 4 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;noflow.
let’s do the opposite. you have some ipv6 connectifity and need to transport ipv4 Host A (IPv6 only) root@hosta ~# ifconfig vio0 vio0: flags=208843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,AUTOCONF6> mtu 1500 lladdr 56:00:02:e7:9d:e5 index 1 priority 0 llprio 3 groups: egress media: Ethernet autoselect status: active inet6 fe80::5400:2ff:fee7:9de5%vio0 prefixlen 64 scopeid 0x1 inet6 2a05:f480:1400:7b6:a9e0:6a15:217:cc5c prefixlen 64 autoconf pltime 604627 vltime 2591827 inet6 2a05:f480:1400:7b6:446d:acb7:5fe4:450f prefixlen 64 autoconf autoconfprivacy pltime 86046 vltime 172537 root@hosta ~# i3 IPv4: !
let’s assume you need ipv6 connectifity somewhere … You can use some Tunnelbrokers or your run OpenBSD on your Boxes and want todo it on your own. Here some hints. Server with DualStack you need a Maschine out in the Internet which is DualStacked stoege@dualstack$ i3 IPv4: 18.104.22.168 IPv6: 2001:db8:100::100 Host with IPv4 only stoege@ipv4 host ~# i3 IPv4: 22.214.171.124 IPv6: !NETWORK and you want to bring IPv4 to the second host
/etc/mrouted.conf name LOCAL 126.96.36.199/16 phyint em1 disable forward multicast sysctl.conf net.inet.ip.mforwarding=1 enable and start Service rcctl enable multicast rcctl start multicast rcctl enable mrouted rcctl start mrouted useful commands netstat -g map-mbone mrinfo mtrace Links https://felix-kling.de/blog/2019/sonos-dedicated-vlan.html sha256: 8f43d20c9f3186346dfab5fb16a3de63b780d414c608ce12f0d096089fbf9642
DualStack & Prefix Delegation with OpenBSD OS: OpenBSD 6.5 Hint: wide-dhcpv6-20080615p9 was not working fine. So, i gave a try with dhcpcd Install Package pkg_add dhcpcd-7.1.1p4 Configure dhcpcd /etc/dhcpcd.conf ipv6only noipv6rs duid persistent option rapid_commit require dhcp_server_identifier # disable running any hooks; not typically required for simple DHCPv6-PD setup script "" # List interfaces explicitly so that dhcpcd doesn't touch others allowinterfaces em1 vlan108 vlan110 vlan112 interface em1 # the following two lines tell dhcpcd to do router solicitation # itself.