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I am trying to create two IPv6 BGP tunnels with two providers (HE.net and Securebit AG). system does not allows to create more than one, whatever the connection I created first works fine. each ISP connections are configured to port forward to my router box

I've used these commands to bring up 1 st connection and it works fine 

ifconfig sit0 up
ifconfig sit0 inet6 tunnel ::216.YYY.YYY.YYY
ifconfig sit1 up
ifconfig sit1 inet6 add YYYY:YYYY:YYYY:e1::2/64

getting these errors when try to bring up 2nd connection

ifconfig sit2 up
sit2: ERROR while getting interface flags: No such device

ifconfig sit2 inet6 tunnel ::80.XXX.XXX.XXX
SIOGIFINDEX: No such device

ifconfig sit3 up
sit3: ERROR while getting interface flags: No such device

ifconfig sit3 inet6 add XXXX:XXXX:XXXX:15b::2/64
SIOGIFINDEX: No such device

my Ipv4 routing table as follows and kernel version is 4.9.35

route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.1.1     0.0.0.0         UG    0      0        0 eth1
default         192.168.8.1     0.0.0.0         UG    203    0        0 eth1
default         192.168.8.1     0.0.0.0         UG    209    0        0 eth2
default         192.168.8.1     0.0.0.0         UG    300    0        0 eth2
80.XXX.XXX.0    192.168.8.1     255.255.240.0   UG    0      0        0 eth2
94.XXX.XXX.0    192.168.8.1     255.255.255.0   UG    0      0        0 eth2
link-local      *               255.255.0.0     U     202    0        0 eth0
link-local      *               255.255.0.0     U     204    0        0 docker0
link-local      *               255.255.0.0     U     206    0        0 vethef89bf3
172.17.0.0      *               255.255.0.0     U     0      0        0 docker0
192.168.1.0     *               255.255.255.0   U     0      0        0 eth1
192.168.8.0     *               255.255.255.0   U     203    0        0 eth1
192.168.8.0     *               255.255.255.0   U     209    0        0 eth2
192.168.100.0   *               255.255.255.0   U     0      0        0 eth0
216.YY.YY.0     192.168.1.1     255.255.240.0   UG    0      0        0 eth1

do you have any clue on this ? Thanks

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  • Why does your "first connection" consist of two interfaces?
    – u1686_grawity
    Dec 15, 2019 at 18:36
  • @grawity I've used default configuration for linux-net-tools provided by he.net
    – Melan
    Dec 15, 2019 at 18:39

1 Answer 1

Reset to default
1

Your kernel version is new enough that you should be using iproute2 instead of the 2.4-era tools.

Ignore sit0; explicitly create a new interface for every connection:

ip link add henet type sit local 192.168.1.x remote 216.66.84.y ttl 64
ip addr add 2001:470:yyyy::2/64 dev henet
ip link set henet up

ip link add securebit type sit local 192.168.1.x remote 80.y.y.y ttl 64
ip addr add XXXX:XXXX:XXXX:15b::2/64 dev securebit
ip link set securebit up

Alternatively, if your version of ip link add does not yet support sit tunnels:

ip tunnel add henet mode sit local 192.168.1.x remote 216.66.84.y ttl 64
ip addr add...

Note how each tunnel consists of just one interface in this model, unlike the old system with sit0 having magic properties.

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  • Thanks grawith, I've updated my configurations to use iproute2 now I can create second interlace but still I can't reach my second BGP neighbor using ping6 and but I can see some activity via tcpdump and it's show some checksum mismatch and I believe it's a different issue now I am facing
    – Melan
    Dec 15, 2019 at 19:19

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