Re: [Dnsmasq-discuss] IPv6 - Router Advertisement
On 14/11/13 17:38, Tsachi wrote: Hi, I have a question regarding dnsmasq behavior regarding IPv6 RA message while using the constructor config option. Version details: Kernel 2.6.35, Dnsmasq ver 2.67 I am working on a small Linux router device which obtains a single dynamic global \64 prefix from a network (the prefix is changing every time the device connects to the network). This prefix is published (RA) on the device LAN interface (eth0) for the purpose of hosts Global address generation (using SLAAC). The following dnsmasq ipv6 configurations are set: dhcp-range=::,constructor:eth0, ra-only,64,60 log-dhcp dhcp-option=option6:23,[::] ra-param=eth0,20 The LAN interface (eth0) starts with link local address. After the device connects to the network, a new ipv6 global address is manually assigned to the eth0 interface ( \64 constructed from the prefix that the device received). ip addr add 2002::21a:2bff:fe3c:4d5e/64 dev eth0 As expected, this triggers periodic unsolicited RA messages (and RA responses to RS). Log shows the following RA messages - RTR-ADVERT(eth0) 2002:: After some time the device disconnects from the network and then the eth0 IPv6 address is removed: ip addr del 2002::21a:2bff:fe3c:4d5e/64 dev eth0 The log shows the following RA messages router advertisement on 2002::, old prefix for eth0 But the log doesn't show – RTR-ADVERT messages (nor the device sends any RA after, and will not response to RS requests). I was hoping to see an unsolicited RA massage (RTR-ADVERT) announcing this prefix with preferred-time=0 and maybe also router lifetime=0, so hosts are aware of the disconnection. What do you think regarding unsolicited RA massage when the interface global ip address is deleted? What you describe (RA with preferred time zero) is exactly what should happen, so this looks like a bug. By the way, In a different scenario, if I delete the interface ipv6 address and add a new one, the log shows: router advertisement on 2012::, old prefix for eth0 router advertisement on 2055::, constructed for eth0 RTR-ADVERT(eth0) 2055:: RTR-ADVERT(eth0) 2012:: old prefix The second prefix is sent with preferred-time=0, as expected. OK, that's useful infromation. I'll investigate further. Cheers, Simon. Thanks, Tsachi ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] IPv6 - Router Advertisement
OK, I found the problem, http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=dd9d9ce54c46b0e110f71f8cb19934bd2e8ae656 or dnsmasq-2.68test2 should fix it. The patch will apply to 2.67, if you'd rather do that. Thanks for the report. Cheers, Simon. On 14/11/13 17:38, Tsachi wrote: Hi, I have a question regarding dnsmasq behavior regarding IPv6 RA message while using the constructor config option. Version details: Kernel 2.6.35, Dnsmasq ver 2.67 I am working on a small Linux router device which obtains a single dynamic global \64 prefix from a network (the prefix is changing every time the device connects to the network). This prefix is published (RA) on the device LAN interface (eth0) for the purpose of hosts Global address generation (using SLAAC). The following dnsmasq ipv6 configurations are set: dhcp-range=::,constructor:eth0, ra-only,64,60 log-dhcp dhcp-option=option6:23,[::] ra-param=eth0,20 The LAN interface (eth0) starts with link local address. After the device connects to the network, a new ipv6 global address is manually assigned to the eth0 interface ( \64 constructed from the prefix that the device received). ip addr add 2002::21a:2bff:fe3c:4d5e/64 dev eth0 As expected, this triggers periodic unsolicited RA messages (and RA responses to RS). Log shows the following RA messages - RTR-ADVERT(eth0) 2002:: After some time the device disconnects from the network and then the eth0 IPv6 address is removed: ip addr del 2002::21a:2bff:fe3c:4d5e/64 dev eth0 The log shows the following RA messages router advertisement on 2002::, old prefix for eth0 But the log doesn't show – RTR-ADVERT messages (nor the device sends any RA after, and will not response to RS requests). I was hoping to see an unsolicited RA massage (RTR-ADVERT) announcing this prefix with preferred-time=0 and maybe also router lifetime=0, so hosts are aware of the disconnection. What do you think regarding unsolicited RA massage when the interface global ip address is deleted? By the way, In a different scenario, if I delete the interface ipv6 address and add a new one, the log shows: router advertisement on 2012::, old prefix for eth0 router advertisement on 2055::, constructed for eth0 RTR-ADVERT(eth0) 2055:: RTR-ADVERT(eth0) 2012:: old prefix The second prefix is sent with preferred-time=0, as expected. Thanks, Tsachi ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] IPv6 - Router Advertisement
Thanks Simon, I will test it and let you know. Also what do you say regarding including router lifetime=0 in the RA msg in this case ? Regards, Tsachi On Fri, Nov 15, 2013 at 1:27 PM, Simon Kelley si...@thekelleys.org.uk wrote: OK, I found the problem, http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=dd9d9ce54c46b0e110f71f8cb19934bd2e8ae656 or dnsmasq-2.68test2 should fix it. The patch will apply to 2.67, if you'd rather do that. Thanks for the report. Cheers, Simon. On 14/11/13 17:38, Tsachi wrote: Hi, I have a question regarding dnsmasq behavior regarding IPv6 RA message while using the constructor config option. Version details: Kernel 2.6.35, Dnsmasq ver 2.67 I am working on a small Linux router device which obtains a single dynamic global \64 prefix from a network (the prefix is changing every time the device connects to the network). This prefix is published (RA) on the device LAN interface (eth0) for the purpose of hosts Global address generation (using SLAAC). The following dnsmasq ipv6 configurations are set: dhcp-range=::,constructor:eth0, ra-only,64,60 log-dhcp dhcp-option=option6:23,[::] ra-param=eth0,20 The LAN interface (eth0) starts with link local address. After the device connects to the network, a new ipv6 global address is manually assigned to the eth0 interface ( \64 constructed from the prefix that the device received). ip addr add 2002::21a:2bff:fe3c:4d5e/64 dev eth0 As expected, this triggers periodic unsolicited RA messages (and RA responses to RS). Log shows the following RA messages - RTR-ADVERT(eth0) 2002:: After some time the device disconnects from the network and then the eth0 IPv6 address is removed: ip addr del 2002::21a:2bff:fe3c:4d5e/64 dev eth0 The log shows the following RA messages router advertisement on 2002::, old prefix for eth0 But the log doesn't show – RTR-ADVERT messages (nor the device sends any RA after, and will not response to RS requests). I was hoping to see an unsolicited RA massage (RTR-ADVERT) announcing this prefix with preferred-time=0 and maybe also router lifetime=0, so hosts are aware of the disconnection. What do you think regarding unsolicited RA massage when the interface global ip address is deleted? By the way, In a different scenario, if I delete the interface ipv6 address and add a new one, the log shows: router advertisement on 2012::, old prefix for eth0 router advertisement on 2055::, constructed for eth0 RTR-ADVERT(eth0) 2055:: RTR-ADVERT(eth0) 2012:: old prefix The second prefix is sent with preferred-time=0, as expected. Thanks, Tsachi ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
Re: [Dnsmasq-discuss] IPv6 - Router Advertisement
On 15/11/13 12:10, Tsachi wrote: Thanks Simon, I will test it and let you know. Also what do you say regarding including router lifetime=0 in the RA msg in this case ? Sorry, I missed that. I just pushed a change to do this. If the ONLY prefixes being advertised have preferred lifetime of zero, then the router lifetime is now set to zero too. Cheers, Simon. Regards, Tsachi On Fri, Nov 15, 2013 at 1:27 PM, Simon Kelleysi...@thekelleys.org.uk wrote: OK, I found the problem, http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=dd9d9ce54c46b0e110f71f8cb19934bd2e8ae656 or dnsmasq-2.68test2 should fix it. The patch will apply to 2.67, if you'd rather do that. Thanks for the report. Cheers, Simon. On 14/11/13 17:38, Tsachi wrote: Hi, I have a question regarding dnsmasq behavior regarding IPv6 RA message while using the constructor config option. Version details: Kernel 2.6.35, Dnsmasq ver 2.67 I am working on a small Linux router device which obtains a single dynamic global \64 prefix from a network (the prefix is changing every time the device connects to the network). This prefix is published (RA) on the device LAN interface (eth0) for the purpose of hosts Global address generation (using SLAAC). The following dnsmasq ipv6 configurations are set: dhcp-range=::,constructor:eth0, ra-only,64,60 log-dhcp dhcp-option=option6:23,[::] ra-param=eth0,20 The LAN interface (eth0) starts with link local address. After the device connects to the network, a new ipv6 global address is manually assigned to the eth0 interface ( \64 constructed from the prefix that the device received). ip addr add 2002::21a:2bff:fe3c:4d5e/64 dev eth0 As expected, this triggers periodic unsolicited RA messages (and RA responses to RS). Log shows the following RA messages - RTR-ADVERT(eth0) 2002:: After some time the device disconnects from the network and then the eth0 IPv6 address is removed: ip addr del 2002::21a:2bff:fe3c:4d5e/64 dev eth0 The log shows the following RA messages router advertisement on 2002::, old prefix for eth0 But the log doesn't show – RTR-ADVERT messages (nor the device sends any RA after, and will not response to RS requests). I was hoping to see an unsolicited RA massage (RTR-ADVERT) announcing this prefix with preferred-time=0 and maybe also router lifetime=0, so hosts are aware of the disconnection. What do you think regarding unsolicited RA massage when the interface global ip address is deleted? By the way, In a different scenario, if I delete the interface ipv6 address and add a new one, the log shows: router advertisement on 2012::, old prefix for eth0 router advertisement on 2055::, constructed for eth0 RTR-ADVERT(eth0) 2055:: RTR-ADVERT(eth0) 2012:: old prefix The second prefix is sent with preferred-time=0, as expected. Thanks, Tsachi ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss ___ Dnsmasq-discuss mailing list Dnsmasq-discuss@lists.thekelleys.org.uk http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
