Nearest demo-server by GeoDNS about vtm

[o-sdn-o]

These steps should be taken

• Acquire GeoIP database from maxmind
• Parse it with a python script

def dist(lat1, lon1, lat2, lon2):
  dLat = deg2rad(lat2 - lat1)
  dLon = deg2rad(lon2 - lon1) 
  a = math.sin(dLat / 2) * math.sin(dLat / 2) + math.cos(deg2rad(lat1)) * math.cos(deg2rad(lat2)) * math.sin(dLon / 2) * math.sin(dLon / 2)
  return 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))

• Split the dns zone netxs.online into views using geo distance bewteew client ip and the servers

acl zone_xxx { ... };
...
match-clients { zone_xxx; };
...
zone netxs.online/IN/frankfurt (signed)
zone netxs.online/IN/oregon (signed)
zone netxs.online/IN/richmond (signed)
zone netxs.online/IN/tokyo (signed)
zone netxs.online/IN/sydney (signed)

• Make the entry netxs.online specific to each zone
• Update SSHFP for every dns-zone

; SSH fingerprints (SHA256 only, ssh-keygen -r _host_name_)
@	IN SSHFP 1 2 5eedec3759855b0ad5c7875dd4f1b552429ba790c236c07e00ac387af44c5aeb
@	IN SSHFP 2 2 ae102d8d401b75682f438ee787bc24ad195a9bc9de91fddffd799a26985687b6
@	IN SSHFP 3 2 1d0af6256783e12d00544aeecb55ed025b10f9dc06e769fca4b5251b1c4178d3
@	IN SSHFP 4 2 d297464eb3d8bf6c672fd091f1eac86ac054125121f79cbab0612957fb1fa4a0

• Test a dns entry of type A netxs.online on any dns checker (like: https://dnschecker.org/#A/netxs.online)