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I generally turn off IPv4 support because things still run smoother without it. I think the main problem is synchronous queries for DNS -- IPv6 first then IPv4

by daveguy 11y ago

I generally turn off IPv4 support because things still run smoother without it. I think the main problem is synchronous queries for DNS -- IPv6 first then IPv4. When something didn't have an IPv6 address it went to IPv4 meaning added delay. If you get an address, but can't get an IPv6 connection to the server -- added delay. IPv6 gets shut down on everything I admin and will continue to do so. I will keep trying IPv6 on 6/6 until everything runs as smoothly and as quickly as IPv4. The first time I have a good experience on IPv6 day with low latency and confirmed functionality across the board I will consider adding more routers and machines. Until then, no IPv6 for me.

vetrom 11y ago
In the glibc world, you can specify a rather fine degree of preferences here for which resolution you prefer for which network space, via /etc/gai.conf. It's not a very nice tool, but I've been able to use it to set good preferences for a dual-stack environment.