Hi Joakim,
it appears that you are experimenting with a special case.
Normally, a sending node decides on the outgoing interface based on the
destination IP prefix. If you don't have a more specific routing entry,
the default IF is correctly chosen in your case.
After the interface is selected, the source needs to decide on the
Layer2 framing. Most link-layer technologies use an addressing
(802.3/11, 15.4 ...) and the MAC address is acquired via ND. In your
case, you mention SLIP. A serial line interface does not use L2
addresses and does not need ND.
Best,
Thomas
On 17/12/2018 08:59, Joakim Nohlgård wrote:
Hi developers,
When using the shell on the gnrc_border_router application trying to
send to an unknown address with its designated prefix, the application
does not send any neighbor solicitations on the wireless network.
When I type ping6 2001:db8::1234 I expected that a neighbor
solicitation query to go out on the interface that has been configured
with the routing destination for 2001:db8::/64, but wireshark shows
that nothing is sent on the wireless, but instead the ICMPv6 packet is
sent immediately over the slip/ethos interface, which is configured as
the default route.
Is this behavior correct or is this a routing bug?
Configurations:
ifconfig
Iface 6 HWaddr: 02:DA:F1:03:BC:48
MTU:1500 HL:64 RTR
RTR_ADV Source address length: 6
Link type: wired
inet6 addr: fe80::da:f1ff:fe03:bc48 scope: local TNT[1]
inet6 addr: fe80::2 scope: local VAL
inet6 group: ff02::2
inet6 group: ff02::1
inet6 group: ff02::1:ff03:bc48
inet6 group: ff02::1:ff00:2
Iface 7 Channel: 26 Page: 0 NID: 0x23
Long HWaddr: 23:31:53:29:36:B7:6E:5A
TX-Power: 0dBm State: IDLE max. Retrans.: 3 CSMA Retries: 4
ACK_REQ CSMA MTU:1280 HL:64 RTR
RTR_ADV IPHC
Source address length: 8
Link type: wireless
inet6 addr: fe80::2131:5329:36b7:6e5a scope: local VAL
inet6 addr: 2001:db8::2131:5329:36b7:6e5a scope: global VAL
inet6 group: ff02::2
inet6 group: ff02::1
inet6 group: ff02::1:ffb7:6e5a
routing:
nib route
2001:db8::/64 dev #7
default* via fe80::1 dev #6
Best regards,
Joakim
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--
Prof. Dr. Thomas C. Schmidt
° Hamburg University of Applied Sciences Berliner Tor 7 °
° Dept. Informatik, Internet Technologies Group 20099 Hamburg, Germany °
° http://inet.haw-hamburg.de/members/schmidt Fon: +49-40-42875-8452 °
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