On Wed, Feb 25, 2015 at 10:27 AM, Michael Mol <mikemol at gmail.com> wrote: > So, I'm seeing a bunch of DHCPv6 traffic coming from my CentOS7 > machines. Basically, the machines are trying to send router > solicitations, the packets are blocked at their egress firewalls, and > I get to see the logs. > > I don't wish to disable IPv6. I don't wish to statically configure > IPv6 at this time. I wish to have the machines no longer attempting to > send router solicitations as part of DHCPv6. > > How do I do this? I tried > > DHCPV6C="no" > > in ifcfg-ifacethatsnoteth0, but that seems to have had no effect. I > still see lines like these: > > Feb 25 10:25:48 proxy-comcast-2 NetworkManager[541]: <error> > [1424877948.384918] [rdisc/nm-lndp-rdisc.c:241] send_rs(): ([snip]): > cannot send router solicitation: -1. > Feb 25 10:25:48 proxy-comcast-2 kernel: OUT-world:IN= OUT=[snip] > SRC=fe80:[snip] DST=ff02:0000:0000:0000:0000:0000:0000:0002 LEN=48 > TC=0 HOPLIMIT=255 FLOWLBL=0 PROTO=ICMPv6 TYPE=133 CODE=0 So, DHCPV6C="no" seems to be useless. What's needed is IPV6INIT="no". That doesn't disable IPv6 (to do that, you have to use sysctl), but it does tell NetworkManager to not try to configure it. Which is fine. -- :wq