Tag: ipv6

  • Juniper Firewalls and IPv6

    I found an interesting side-effect of the Juniper firewalls when you introduce IPv6.  In hindsight it appears perfectly reasonable but if you are not aware of it in the first place you may have a much more permissive firewall than you thought.  My setup is such that my internet address changes every time I connect…

  • IPv6 and address translation

    We’re in that in-between place where there is plenty of IPv4 out there, but sometimes you either need or want to get to IPv6 addresses.  With the IPv4 address allocations out of ARIN now empty there is going to be an increased need of NAT either between the address families or within it.  This is…

  • JFFNMS and IPv6

    One of the many Free Software projects I work on is JFFNMS, which is a network management system written in PHP. In light that the last IPv4 address blocks have now been allocated to APNIC it’s probably timely to look at how to manage network devices in a new IPv6 world. First you need to…

  • Does your program use gethostbyname() ?

    There has been some discussion on the Debian IPv6 list about how the function gethostbyname() has changed.  The manual page says this function is obsolete and with good reason. A new feature of the function is that if a hostname has both IPv4 and IPv6 entries then the order of the return values is not…