Robert Swindells <rjs%fdy2.co.uk@localhost> writes: > Lloyd Parkes <lloyd%must-have-coffee.gen.nz@localhost> wrote: >>The network is a 1Gb/s LAN through to a smaller NetBSD router running >>NPF with MSS clamping enabled so that I can get Netflix. My ISP does not >>use CGN for my IPv4 connection. My IPv6 connection is tunnelled through >>to Hurricane Electric in Sydney, Australia. > > Have you tried disabling IPv6 or explicitly connecting using IPv4 ? > > I don't see any problems using IPv6 through NPF to update cvs but I have > native IPv6 and can use a 1500 byte MTU. I'm also using cvs.n.o instead > of anoncvs.n.o but they have adjacent IPv4 addresses. > > I'm guessing that your IPv6 tunnel has a lower MTU than your IPv4 > connection to your ISP. I update over HE tunnels all the time with no issues (cvs, not anoncvs). IPv6 tends to 1280 MTU; my gif for the tunnel is that, and wthat has all apparently worked fine. So always good to look with tcpdump, but I suspect tunenl MTU is not really an issue. There are sometimes problems with reachability via v6, and sometimes the speeds are lower. More recently, I had one case of v4 reachability failure while v6 worked, and have sometimes seen lower ping times on v6.
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