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godzillante
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IPv6 BGP unreachable nexthop through loopback

Fri May 18, 2018 11:55 am

Hi,

I'm running v6.38.1 on a CCR1036 and have the following scenario (real addresses and AS obscured for privacy):

- loopback address set on a bridge
/ipv6 address add address=aaaa:bbbb:ffff::1/128 advertise=no interface=bridge_myprovider_ipv6

- static route to provider's loopback:
/ipv6 route
add !bgp-as-path !bgp-atomic-aggregate !bgp-communities !bgp-local-pref !bgp-med !bgp-origin !bgp-prepend !check-gateway \
    distance=1 dst-address=cccc:dddd:0:e::/128 gateway=fe80::aa:bb:cc:1%ether12_WAN-myprovider

I can ping the gateway without problems
> ping cccc:dddd:0:e::  
  SEQ HOST                                     SIZE TTL TIME  STATUS                                                                 
    0 cccc:dddd:0:e::                             56  55 30ms  echo reply                                                             
    1 cccc:dddd:0:e::                             56  55 30ms  echo reply                                                             
    sent=2 received=2 packet-loss=0% min-rtt=30ms avg-rtt=30ms max-rtt=30ms

But when I receive the default route via cccc:dddd:0:e:: (through multihop BGP), it's deemed "unreachable":
/ipv6 route print detail

[...]

1  Db  dst-address=2000::/3 gateway=cccc:dddd:0:e:: gateway-status=cccc:dddd:0:e:: unreachable distance=20 scope=40 target-scope=30 
        bgp-as-path="00000" bgp-origin=igp received-from=myprovider_IPv6_peer

What am I doing wrong?

Thanks!
 
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mrz
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Re: IPv6 BGP unreachable nexthop through loopback

Fri May 18, 2018 11:59 am

Currently recursive routing will not work if gateway is link local address.
 
godzillante
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Re: IPv6 BGP unreachable nexthop through loopback

Fri May 18, 2018 12:17 pm

Currently recursive routing will not work if gateway is link local address.
thank you mrz. so what's a possible solution?
I have other peers which allow BGP through a /126 or /127 ptp, but this one provider is not going to allow me.
 
patrick7
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Re: IPv6 BGP unreachable nexthop through loopback

Fri May 18, 2018 3:07 pm

The solution offered by MikroTik: If you are lucky, it will be solved with RouterOS v7!
viewtopic.php?f=14&t=42268#p425845
 
godzillante
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Re: IPv6 BGP unreachable nexthop through loopback

Fri May 18, 2018 4:06 pm

The solution offered by MikroTik: If you are lucky, it will be solved with RouterOS v7!
viewtopic.php?f=14&t=42268#p425845

I was aware of that thread :lol: just hoping there might be some alternative solution... or even an hack :(
 
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sri2007
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Re: IPv6 BGP unreachable nexthop through loopback

Fri May 18, 2018 5:18 pm

Or maybe the next solution will be to re-design using WANs only instead of loopbacks, at least until RouterOS 7 arrives :)
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