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jprietove
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Bug: 6to4 tunnel critical kernel failure on RouterOS v7.5+

Mon Dec 12, 2022 5:55 pm

Hello, I have been testing 6to4 tunnels and RouterOS reboots with critical kernel failure when packets are forwarded by the tunnel. This has been tested in v7.5, v7.6 and v7.7rc1.

Simple scenario: R1 ether1 ----- RX ---- ether1 R2
# R1
/interface 6to4
add !keepalive local-address=192.168.1.2 name=6to4-tunnel11
/ip address
add address=192.168.1.2/24 interface=ether1 network=192.168.1.0
/ip route
add gateway=192.168.1.1
/ipv6 route
add dst-address=2002::/16 gateway=6to4-tunnel1
/ipv6 address
add address=2002:c0a8:102::1 advertise=no interface=6to4-tunnel1
/system identity
set name=R1

# R2
/interface 6to4
add !keepalive local-address=192.168.2.2 name=6to4-tunnel11
/ip address
add address=192.168.2.2/24 interface=ether1 network=192.168.2.0
/ip route
add gateway=192.168.2.1
/ipv6 route
add dst-address=2002::/16 gateway=6to4-tunnel1
/ipv6 address
add address=2002:c0a8:202::1 advertise=no interface=6to4-tunnel1
/system identity
set name=R2

When perfoming a ping:
[admin@R2] > ping 2002:c0a8:102::1

After a while the router reboots and the log shows:
  MikroTik RouterOS 7.7rc1 (c) 1999-2022       https://www.mikrotik.com/

Press F1 for help


dec/12/2022 15:42:14 system,error,critical kernel failure in previous boot
 
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jprietove
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Re: Bug: 6to4 tunnel critical kernel failure on RouterOS v7.5+

Mon Dec 12, 2022 6:03 pm

Reported with #[SUP-100809]
 
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rextended
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Re: Bug: 6to4 tunnel critical kernel failure on RouterOS v7.5+

Mon Dec 12, 2022 7:30 pm

Netinstalled device or upgraded from 6.x in the past?
 
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jprietove
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Re: Bug: 6to4 tunnel critical kernel failure on RouterOS v7.5+

Mon Dec 12, 2022 9:39 pm

Tested in CHR new install, not coming from an upgrade.
 
Sob
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Re: Bug: 6to4 tunnel critical kernel failure on RouterOS v7.5+

Sun Dec 18, 2022 12:14 am

Yep, it's broken. Already reported as SUP-97719.

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