Hi,

I am a load tester at the BBC in London.

I am testing latencies between IPv4 & IPv6.

I am using Ubuntu 16 LTS and this is my current sysctl.conf.

# /etc/sysctl.conf
net.ipv4.tcp_max_syn_backlog = 40000
net.core.somaxconn = 40000
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_moderate_rcvbuf = 1
net.core.rmem_max = 134217728
net.core.wmem_max = 134217728
net.ipv4.tcp_mem = 134217728 134217728 134217728
net.ipv4.tcp_rmem = 4096 277750 134217728
net.ipv4.tcp_wmem = 4096 277750 134217728
net.core.netdev_max_backlog = 300000
net.ipv4.ip_local_port_range="1025 65535"

I have obviously increased ephemeral ports and the ulimit.

What optimisations do I need for IPv6?

Many Thanks

Aidy

Maybe there are some optimizations in this guide?

http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/

You can use this search to help if you want.
https://www.google.com/search?q=opti...kernel+options

What kind of optimizations do you want? More options for Address autoconfiguration? Mandatory multicast addresses? <trying to help as I'm not sure which ones you need>

Are you trying to adjust settings?

https://wiki.ubuntu.com/IPv6

I found a list of optimizations in this /etc/sysctl.conf at the end of where IPv6 networking ends.
I'm thinking that they should be listed in your configuration file.

TCP and memory optimization : (just an example)

https://www.cyberciti.biz/faq/linux-...ity-hardening/