I struggled with this under CentOS 7. I think there is a bug.
You can run /usr/sbin/radvdump to print out RAs. Leave it running for
some minutes.
I had this in my /etc/sysctl.d/50-net6.conf (on C7):
#
# IPv6 Forwarding
#
net.ipv6.conf.all.forwarding = 1
net.ipv6.conf.default.forwarding = 1
net.ipv6.conf.all.accept_ra = 1
net.ipv6.conf.default.accept_ra = 1
#
# Fix bug to received RAs from Router
# Disable forwarding on enp4s0f1 interface so we still get RAs
#
net.ipv6.conf.enp4s0f1.forwarding = 0
#net.ipv6.conf.enp4s0f1.accept_ra = 1
where enp4s0f1 is the WAN interface. Note that ipv6 forwarding still
works. I used my C7 as a firewall/gateway.
I am running 8.1 now.
Alan
--
Alan McRae
On 29/04/2020 06:54, Kenneth Porter wrote:
I just got 50 Mbps symmetric fiber from AT&T and it includes a /56 of
IPv6 addresses, replacing a much slower ADSL line. I never tried to
get IPv6 working on the old connection. I'm using CentOS 7 as a
gateway and it's worked great for several versions for IPv4.
I'm not seeing any IPv6 default route on the WAN interface. I suspect
I'm not getting route announcements. I think I have all the IPv6
variables in ifcfg-em2 set right. But I do notice that the accept_ra
file in proc for that interface has value 1, not 2. Changing it to 2
doesn't change anything, though. No route appears.
While I wait for an answer to my trouble ticket, is there some way to
verify that I'm not receiving any RA packets? Is there a way to force
a solicitation for one? Is there a tcpdump invocation I can use to
watch for them? Are there log messages that will tell me when an RA
has been seen and added to the routing table or ignored?
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