I forgot to ask, please don't make fun of me for the ancient Linksys wifi router being used as a switch. It's what I had laying around when I needed it. I plan to replace it when I get the chance with a Dell 3024 managed switch I picked up the other day.
On Wed, Aug 14, 2013 at 7:57 PM, Adam Hunt <[email protected]> wrote: > So, I finally managed to get it up. My IPv6 tunnel that is. While I can > bring the tunnel up, test-ipv6.com gives me a passing grade, I can > connect to many sites via IPv6 (e.g. ipv6.google.com), and I've been able > to ping pretty much any v6 connected host without issue. The thing is I'm > not able to connect to all v6 sites (using my browser). Sites that I'm > unable to connect to include things that I "know" work such as pfsense.org > ,doc.pfsense.org, freebsd.org, and others. > > Below is a simplified diagram of my network. Aside from what's shown there > are a few wireless access points, some wireless clients, and various VMs > running on VMWare Workstation 9 on the Windows 7 workstation. > > CenturyLink > (PPPoE, dyn IP) > ^ > | > v > ZyXel Q100 > VDSL modem/bridge > ^ > | > v > pfSense 2.0-rc0 > (sigmund) > ^ > | > v > 10/100 ethernet > switch > (WRT54GS running > DD-WRT) > ^ > | > v > Windows 7 Workstaion > (drogon) > > I did some chatting with a few people in #ipv6 (irc:// > irc.freenode.org/ipv6). The prevailing theory is that my issues are > related to an MTU mismatch. The way I understand it is that PMTU is > mandatory in IPv6. I'm not all that familiar with tunneling to begin with > and in this particular setup there are more layers than I care for (PPPoE, > and a 6in4 to HE). > > Sigmund, my pfSense box, it's a Dell Latitude D620 laptop with an onboard > Broadcom gigabit NIC (bge driver) facing my LAN, and a DEC/Intel 21143 > CardBus NIC (dc driver) on the WAN side attached to my DSL bridge which is > operating as a transparent bridge (RFC 1483). This setup has been up and > running flawlessly for months. > > As for interfaces I have "CENTURYLINK" (aka WAN) connected to PPPOE0(dc0), > LAN connected to bge0, DSLBRIDGE (aka OPT1 that allows me to connect to the > DSL bridge's web interface) connected to bge0, and HEv6 connected to the > GIF tunnel. > > Prior to my work on this tunnel all my MTUs have been untouched, left at > their default 1500 and everything has worked fine. After discovering the > issue of not being able to connect to some sites via v6 I started playing > around with the MUTs on various interfaces. Occasionally I was able to > successfully connect via v6 to some of the sites that I had previously been > unable to browse to. If memory serves things worked when I set the MTU on > my HEv6 interface to the minimum allowed for IPv6 1280. The part that > confuses the hell out of me is that it wouldn't work all the time. > Sometimes I could connect, the next time the connection timed out. > > I'm pretty new to IPv6. I'm entirely unfamiliar with PMTU and MSS so at a > certain point I'm just making random changes and seeing what happens (I > kind of feel like a kid with a fork and an electrical outlet). > > Is there anyone out there that might be able to give me some idea of where > I should go from here? I'd appreciate any help that you can give. > > Thanks for your time. > > Adam >
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