Re: ipv6 accept_ra
On 6/28/22, Anssi Saari wrote: > Lee writes: > >> I have a desktop and a laptop - neither one is picking up the ipv6 >> network prefix from the router advertisement. 'ifconfig -a' on both >> show a single 'inet6 fe80::' line under each interface. > > Well, how do you manage your network? Poorly.. Verizon just enabled ipv6 in my area, so I'm trying to figure out how to get ipv6 working internally. > Is there a checkbox to check or uncheck somewhere? Yup - that was it. Netgate firewall had the DHCPv6 Server & RA set for Managed -- change it to Assisted and everything gets the ipv6 prefix info now. >> I checked with wireshark - the RAs look good. > > Checked how? Superficially :( The RA prefix information just had the On-link flag(L) After changing the DHCPv6 Server & RA router mode to assisted the RA prefix information had both the On-link flag(L) and the Autonomous address-configuration flag(A) set >> How do I get the default "accept_ra = 1" set on _all_ interfaces? > > You use sysctl -w to set those permanently. For testing, manipulate the > virtual files in /proc/sys/net/ipv6/conf/. > > Although, to me that looks OK, as in, it's what I have and for me IPv6 > works, weird as it is. Forwarding is off and accept_ra is like yours: > > net.ipv6.conf.all.accept_ra = 1 > net.ipv6.conf.default.accept_ra = 1 > net.ipv6.conf.docker0.accept_ra = 0 > net.ipv6.conf.enp5s0.accept_ra = 0 > net.ipv6.conf.lo.accept_ra = 1 > > and yet enp5s0 has a public IPv6 address. Same here. Forwarding is off, accept_ra is unchanged and yet ipv6 works for me now. https://sysctl-explorer.net/net/ipv6/accept_ra/ has this bit Possible values are: 0 Do not accept Router Advertisements. but router advertisements are clearly being accepted. .. or I'm not understanding what 'Router Advertisements' means. *sigh* Thanks Lee
Re: ipv6 accept_ra
Lee writes: > I have a desktop and a laptop - neither one is picking up the ipv6 > network prefix from the router advertisement. 'ifconfig -a' on both > show a single 'inet6 fe80::' line under each interface. Well, how do you manage your network? Is there a checkbox to check or uncheck somewhere? A firewall blocking the RAs? For me IPv6 works without enabling anything specifically. On my computers I mostly use systemd-networkd but I seem to have nothing IPv6-related in configuration. Except in the router but there it's to make sure RAs are sent and since I only have 6rd, the tunnel is created. > I checked with wireshark - the RAs look good. Checked how? > but so is accept_ra > $ sysctl -a 2>/dev/null | grep 'accept_ra ' > net.ipv6.conf.all.accept_ra = 1 > net.ipv6.conf.default.accept_ra = 1 > net.ipv6.conf.enp1s0.accept_ra = 0 > net.ipv6.conf.lo.accept_ra = 1 > net.ipv6.conf.wlp2s0.accept_ra = 0 > > How do I get the default "accept_ra = 1" set on _all_ interfaces? You use sysctl -w to set those permanently. For testing, manipulate the virtual files in /proc/sys/net/ipv6/conf/. Although, to me that looks OK, as in, it's what I have and for me IPv6 works, weird as it is. Forwarding is off and accept_ra is like yours: net.ipv6.conf.all.accept_ra = 1 net.ipv6.conf.default.accept_ra = 1 net.ipv6.conf.docker0.accept_ra = 0 net.ipv6.conf.enp5s0.accept_ra = 0 net.ipv6.conf.lo.accept_ra = 1 and yet enp5s0 has a public IPv6 address.
ipv6 accept_ra
I have a desktop and a laptop - neither one is picking up the ipv6 network prefix from the router advertisement. 'ifconfig -a' on both show a single 'inet6 fe80::' line under each interface. if it makes a difference: $ cat /etc/debian_version 11.3 I checked with wireshark - the RAs look good. After some searching I came across this https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt accept_ra - INTEGER Accept Router Advertisements; autoconfigure using them. It also determines whether or not to transmit Router Solicitations. If and only if the functional setting is to accept Router Advertisements, Router Solicitations will be transmitted. Possible values are: 0 Do not accept Router Advertisements. 1 Accept Router Advertisements if forwarding is disabled. 2 Overrule forwarding behaviour. Accept Router Advertisements even if forwarding is enabled. Functional default: enabled if local forwarding is disabled. disabled if local forwarding is enabled. local forwarding is disabled $ sysctl -a 2>/dev/null | grep ipv6 | grep 'forwarding ' net.ipv6.conf.all.forwarding = 0 net.ipv6.conf.all.mc_forwarding = 0 net.ipv6.conf.default.forwarding = 0 net.ipv6.conf.default.mc_forwarding = 0 net.ipv6.conf.enp1s0.forwarding = 0 net.ipv6.conf.enp1s0.mc_forwarding = 0 net.ipv6.conf.lo.forwarding = 0 net.ipv6.conf.lo.mc_forwarding = 0 net.ipv6.conf.wlp2s0.forwarding = 0 net.ipv6.conf.wlp2s0.mc_forwarding = 0 but so is accept_ra $ sysctl -a 2>/dev/null | grep 'accept_ra ' net.ipv6.conf.all.accept_ra = 1 net.ipv6.conf.default.accept_ra = 1 net.ipv6.conf.enp1s0.accept_ra = 0 net.ipv6.conf.lo.accept_ra = 1 net.ipv6.conf.wlp2s0.accept_ra = 0 How do I get the default "accept_ra = 1" set on _all_ interfaces? TIA, Lee
