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bin/53247: loss of IPv6 address with DHCP in netbsd-8
>Synopsis: loss of IPv6 address with DHCP in netbsd-8
>Arrival-Date: Tue May 01 15:25:00 +0000 2018
NetBSD rbixler.britannica.net 8.0_RC1 NetBSD 8.0_RC1 (GENERIC) #6: Sun Apr 29 21:28:22 CDT 2018 rcb%rbixler.britannica.net@localhost:/usr/src/sys/arch/amd64/compile/obj/GENERIC amd64
After booting up the system with dhcpcd to obtain both IPv4 and IPv6 addresses, I notice after a day or more that I lose the IPv6 address. I noticed this problem for the first time after I updated to a regular netbsd-8 build from nyftp.netbsd.org from "NetBSD 8.0_BETA (GENERIC.201804122330Z)". I installed it the next day, the 13th and it ran a few days without incident. Then I saw the following message in /var/log/messages:
Apr 18 08:33:35 rbixler dhcpcd: ipv6nd_handledata: No buffer space available
30 minutes later, all of my IPv6 routes expired:
Apr 18 09:03:35 rbixler dhcpcd: re0: fe80::ec4:7aff:feda:2df3: router expired
Apr 18 09:03:35 rbixler dhcpcd: re0: fe80::ec4:7aff:feda:2d5b: router expired
Apr 18 09:03:35 rbixler dhcpcd: re0: fe80::ec4:7aff:feda:2e47: router expired
and I lost my IPv6 address:
Apr 18 09:03:35 rbixler dhcpcd: re0: expired address 2620:105:c000:3:e8a3:dd9a:4e6b:10a2/64
Apr 18 09:03:35 rbixler dhcpcd: re0: deleting route to 2620:105:c000:3::/64
Apr 18 09:03:35 rbixler dhcpcd: re0: deleting default route via fe80::ec4:7aff:feda:2df3
Apr 18 09:03:35 rbixler dhcpcd: re0: dropping DHCPv6 due to no valid routers
The problem is reproduceable. I have also tried to use dhcpcd in IPv4-only mode and get my IPv6 address with plain autoconfiguration and, in that case, it is stable. I hadn't seen this problem until after the update on the 13th. I updated the system about a week earlier and didn't see the problem then. I have updated to NetBSD-8_RC1 since the 13th and the problem persists.
Boot the system using dhcpcd to obtain IPv6 address and, after a few days, I lose all IPv6 routes and the IPv6 address.
Downgrading to netbsd-8 as of April 6th or so would fix it.
IPv6 autoconfiguration or static configuration also work.
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