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Re: IPv6 forwarding fail = mbuf leak?
>>> What is the interface type on the upstream link?
>> As seen by the host, Ethernet. The physical layer is DSL (MVL, to
>> be specific), [...]. (In case it matters, the DSL CPE is behind a
>> switch which vlan-trunks that, among other things, to the router
>> The other end is not a mass-market big-ISP head; the DSL is being
>> run over dry copper to a DSLAM at my upstream/employer.
> Wow, how unusual.
> What driver (wm? fxp? vr?) is in use?
The one underlying the vlans? fxp. The only fxp - indeed, the only
real Ethernet hardware - in the system.
> Is the underlying physical interface the same one for the
> DSl-facing vlan as the house-lan-facing vlan?
Yes (as you can no doubt deduce from the above :-).
>>> Static route, or some IGP, or BGP, or ?
>> Entirely manually-configured statics.
> So this should be easy to reproduce. I do wonder if it has to do
> with vlans.
I now suspect it may. I just tried it with a setup involving multiple
real hardware interfaces and have been unable to reproduce it. This
news is just minutes old, so I haven't had a chance to set up a closer
replica involving vlans (preferably over fxp). I should see if I have
a vlan-capable switch here (I'm in a different city at the moment,
working with my secondary house LAN, not the primary one this first
If necessary I'll put the system I saw this on back the way it was, but
if it takes that then it'll slow down the hypothesize-test cycle
> I dimly remember that ARP used to store a packet when sending an arp
> request, so that it could send it when the reply came.
It does. I've sometimes started a ping and then, when the destination
host finally answered, getting a ping with RTT in the tens or hundreds
> But that requires freeing the old one (with a queue of 1).
Or freeing the new one, which the high RTTs I've seen imply is what
> I am unclear on how NDP does this, but it's something else to check.
I'm not sure either. It's something I should check.
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