Bug#407217: not just on thecus devices...
Copying Francois Romieu:
* David Monro <email@example.com> [2008-12-13 01:00]:
> I seem to have exactly the same issue on a normal PC
> *motherboard is a Gigabyte GA-MA78GPM-DS2H
> *lspci reports
> 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
> * kernel messages:
> [ 1.331851] r8169 Gigabit Ethernet driver 2.2LK-NAPI loaded
> [ 1.331851] eth0: RTL8168c/8111c at 0xffffc2000062c000,
> 00:1f:d0:9b:88:5d, XID 3c4000c0 IRQ 1278
> [ 20.968195] r8169: eth0: link up
> [ 20.970312] r8169: eth0: link up
> [ 31.939540] eth0: no IPv6 routers present
> * kernel is linux-image-2.6.26-1-amd64 2.6.26-11 (current lenny kernel)
> Symptoms are consistent with broken multicast; it doesn't autoconfigure
> ipv6 addresses and claims there is no router present, and manually
> configuring the ipv6 address allows the computer to connect out to other
> ipv6 machines, but if it has been idle on the network for a while, other
> machines can't connect to it (but can connect on ipv4) presumably
> because it doesn't hear the neighbour solicitation requests.
> Setting allmulti on the interface seems to solve it for now, so I've
> just got that as a post-up in /etc/network/interfaces, but *ick*.
> Is this ever going to be fixed??
I'm not sure if Francois Romieu has made any progress with this.