ungleich-graphviz/nicos-ipv6-vpn-routing-issu...

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digraph G {
node [ shape=box ]
label="Why IPv6 upstream on test devices does not work
ICMP works as it's on 1 reply
SSH does not work
Testdev only receives first syn, not 2nd ack packet
Notebook receives duplicated syn-ack packets from testdev
Likely problem: router does not see return packet and drops the packet, no session entry?
It's an outgoing packet, so this should not be a problem
Router seems only to send first syn packet from the client
VERIFIED by disabling ip6tables / flushing rules"
notebook [ label="Notebook: 2a0a:e5c0:13::a/64" ]
router [ label="Router: 2a0a:e5c0:13::42/64" ]
testdev [ label="Testdev: 2a0a:e5c0:13::zz/64" ]
vpnserver [ label="VPN server" ]
vpnserver->testdev [ label="Route for 2a0a:e5c1:VPN::/48" ]
notebook->router [ label="1. Connect to 2a0a:e5c1:VPN::42\nWith MAC
of router" ]
router->vpnserver [ label="2. Forwarding packing for Testdev to
router" ]
vpnserver->testdev [ label="3. Forwarding packing for Testdev via
VPN" ]
testdev->notebook [ label="4. Reply directly to notebook\n
testdev has same local network as notebook
Using a different mac address than the router has" ]
}