gnrc_border_router stops routing after a while #16398
Description
Description
After a while the border router will stop routing any traffic from or to the WPAN.
The border router can still reach hosts outside the WPAN so the uplink connection is still intact.
Nodes can still reach the border router on it's 6lo interface, so the wireless connection is also still intact.
However, routing between the two interfaces ceases to work.
When the border router is rebooted, routing between WPAN and WAN is working again.
Steps to reproduce the issue
- flash a node with the
examples/gnrc_border_routerfirmware (I used asame54-xprowith ethernet uplink and at86rf215 extension module, but this has also been observed with SLIP on a custom board) - flash several nodes with
examples/gnrc_networkingfirmware withUSEMODULE += gnrc_ipv6_router_defaultchanged toUSEMODULE += gnrc_ipv6_defaultto avoid having nodes act as routers. - ???
- disconnect nodes for a couple of minutes
- bring in new nodes to the WPAN
Expected results
- The border router can reach hosts outside the WPAN
- 6lo nodes get a global prefix
- 6lo nodes can reach hosts outside the WPAN
Actual results
- The border router can reach hosts outside the WPAN
2021-04-26 21:32:12,759 # Iface 6 HWaddr: FC:C2:3D:0D:2D:1F
2021-04-26 21:32:12,764 # L2-PDU:1500 MTU:1492 HL:255 RTR
2021-04-26 21:32:12,767 # Source address length: 6
2021-04-26 21:32:12,769 # Link type: wired
2021-04-26 21:32:12,775 # inet6 addr: fe80::fec2:3dff:fe0d:2d1f scope: link VAL
2021-04-26 21:32:12,782 # inet6 addr: 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f scope: global VAL
2021-04-26 21:32:12,785 # inet6 group: ff02::2
2021-04-26 21:32:12,787 # inet6 group: ff02::1
2021-04-26 21:32:12,791 # inet6 group: ff02::1:ff0d:2d1f
2021-04-26 21:32:12,792 #
2021-04-26 21:32:12,798 # Iface 5 HWaddr: 6A:E4 Channel: 26 Page: 0 NID: 0x23 PHY: O-QPSK
2021-04-26 21:32:12,799 #
2021-04-26 21:32:12,804 # Long HWaddr: E6:EA:AF:F8:AF:5D:EA:E4
2021-04-26 21:32:12,810 # TX-Power: 0dBm State: IDLE max. Retrans.: 3 CSMA Retries: 4
2021-04-26 21:32:12,816 # AUTOACK ACK_REQ CSMA L2-PDU:102 MTU:1280 HL:64 RTR
2021-04-26 21:32:12,819 # RTR_ADV 6LO IPHC
2021-04-26 21:32:12,822 # Source address length: 8
2021-04-26 21:32:12,825 # Link type: wireless
2021-04-26 21:32:12,831 # inet6 addr: fe80::e4ea:aff8:af5d:eae4 scope: link VAL
2021-04-26 21:32:12,838 # inet6 addr: 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4 scope: global VAL
2021-04-26 21:32:12,840 # inet6 group: ff02::2
2021-04-26 21:32:12,843 # inet6 group: ff02::1
2021-04-26 21:32:12,847 # inet6 group: ff02::1:ff5d:eae4
2021-04-26 21:32:12,848 #
2021-04-26 21:34:36,491 # nib neigh
2021-04-26 21:34:36,499 # 2001:16b8:457f:b9f4:fc32:9114:cac:8f97 dev #5 lladdr FE:32:91:14:0C:AC:8F:97 STALE REGISTERED
2021-04-26 21:34:36,505 # fe80::de39:6fff:fe6a:6980 dev #6 lladdr DC:39:6F:6A:69:80 router STALE GC
2021-04-26 21:34:36,514 # 2001:16b8:457f:b9f4:ac8d:fee1:6041:91f1 dev #5 lladdr AE:8D:FE:E1:60:41:91:F1 STALE REGISTERED
2021-04-26 21:34:36,522 # 2001:16b8:457f:b9f4:fec2:3d00:0:bb1 dev #5 lladdr FC:C2:3D:00:00:00:0B:B1 STALE REGISTERED
2021-04-26 21:34:36,530 # 2001:16b8:457f:b9f4:204:2519:1801:c905 dev #5 lladdr 00:04:25:19:18:01:C9:05 STALE REGISTERED
2021-04-26 21:34:36,538 # 2001:16b8:457f:b9f4:a83c:23b3:10e6:9c05 dev #5 lladdr AA:3C:23:B3:10:E6:9C:05 STALE REGISTERED
2021-04-26 21:34:36,546 # 2001:16b8:457f:b900:de39:6fff:fe6a:6980 dev #6 lladdr DC:39:6F:6A:69:80 router STALE GC
2021-04-26 21:34:41,867 # ping 2600::
2021-04-26 21:34:42,003 # 12 bytes from 2600::: icmp_seq=0 ttl=49 time=131.040 ms
2021-04-26 21:34:43,002 # 12 bytes from 2600::: icmp_seq=1 ttl=49 time=130.810 ms
2021-04-26 21:34:44,002 # 12 bytes from 2600::: icmp_seq=2 ttl=49 time=130.576 ms
2021-04-26 21:34:44,002 #
2021-04-26 21:34:44,005 # --- 2600:: PING statistics ---
2021-04-26 21:34:44,010 # 3 packets transmitted, 3 packets received, 0% packet loss
2021-04-26 21:34:44,014 # round-trip min/avg/max = 130.576/130.808/131.040 ms
2021-04-26 21:39:24,198 # nib prefix
2021-04-26 21:39:24,204 # 2001:16b8:457f:b9f4::/62 dev #5 expires 4214 sec deprecates 614 sec
2021-04-26 21:39:24,210 # 2001:16b8:457f:b900::/64 dev #6 expires 6811 sec deprecates 3211 sec
2021-04-26 21:40:00,245 # nib route
2021-04-26 21:40:00,248 # 2001:16b8:457f:b9f4::/62 dev #5
2021-04-26 21:40:00,251 # 2001:16b8:457f:b900::/64 dev #6
2021-04-26 21:40:00,255 # default* via fe80::de39:6fff:fe6a:6980 dev #6
- 6lo nodes get a global prefix
- 6lo nodes can't reach nodes outside the WPAN
2021-04-26 21:35:35,122 # Iface 7 HWaddr: 1C:05 Channel: 26 NID: 0x23 PHY: O-QPSK
2021-04-26 21:35:35,123 # Long HWaddr: AA:3C:23:B3:10:E6:9C:05
2021-04-26 21:35:35,124 # State: IDLE
2021-04-26 21:35:35,125 # ACK_REQ L2-PDU:102 MTU:1280 HL:64 6LO
2021-04-26 21:35:35,126 # IPHC
2021-04-26 21:35:35,127 # Source address length: 8
2021-04-26 21:35:35,128 # Link type: wireless
2021-04-26 21:35:35,129 # inet6 addr: fe80::a83c:23b3:10e6:9c05 scope: link VAL
2021-04-26 21:35:35,131 # inet6 addr: 2001:16b8:457f:b9f4:a83c:23b3:10e6:9c05 scope: global VAL
2021-04-26 21:35:35,132 # inet6 group: ff02::1
2021-04-26 21:35:35,132 #
2021-04-26 21:35:35,133 # Statistics for Layer 2
2021-04-26 21:35:35,134 # RX packets 140 bytes 14511
2021-04-26 21:35:35,134 # TX packets 9 (Multicast: 1) bytes 0
2021-04-26 21:35:35,135 # TX succeeded 9 errors 0
2021-04-26 21:35:35,135 # Statistics for IPv6
2021-04-26 21:35:35,136 # RX packets 33 bytes 11547
2021-04-26 21:35:35,136 # TX packets 9 (Multicast: 1) bytes 536
2021-04-26 21:35:35,137 # TX succeeded 9 errors 0
2021-04-26 21:35:35,137 #
2021-04-26 21:35:37,329 # ping 2600::
2021-04-26 21:35:40,329 #
2021-04-26 21:35:40,330 # --- 2600:: PING statistics ---
2021-04-26 21:35:40,331 # 3 packets transmitted, 0 packets received, 100% packet loss
2021-04-26 21:35:55,064 # nib route
2021-04-26 21:35:55,066 # default* via fe80::e4ea:aff8:af5d:eae4 dev #7
border router is still reachable using global address on 6lo interface
2021-04-26 21:41:56,524 # ping 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4
2021-04-26 21:41:56,532 # 12 bytes from 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4: icmp_seq=0 ttl=64 rssi=68 dBm time=5.984 ms
2021-04-26 21:41:57,533 # 12 bytes from 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4: icmp_seq=1 ttl=64 rssi=68 dBm time=5.984 ms
2021-04-26 21:41:58,533 # 12 bytes from 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4: icmp_seq=2 ttl=64 rssi=68 dBm time=6.624 ms
2021-04-26 21:41:58,533 #
2021-04-26 21:41:58,534 # --- 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4 PING statistics ---
2021-04-26 21:41:58,534 # 3 packets transmitted, 3 packets received, 0% packet loss
2021-04-26 21:41:58,535 # round-trip min/avg/max = 5.984/6.197/6.624 ms
global address of uplink interface is not reachable
2021-04-26 21:42:09,260 # ping 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f
2021-04-26 21:42:12,260 #
2021-04-26 21:42:12,262 # --- 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f PING statistics ---
2021-04-26 21:42:12,263 # 3 packets transmitted, 0 packets received, 100% packet loss
From Linux, the border router is reachable via it's uplink interface, but no via it's 6lo interface:
% ping 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f
PING 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f(2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f) 56 data bytes
64 bytes from 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f: icmp_seq=1 ttl=255 time=630 ms
64 bytes from 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f: icmp_seq=2 ttl=255 time=129 ms
64 bytes from 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f: icmp_seq=3 ttl=255 time=32.8 ms
64 bytes from 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f: icmp_seq=4 ttl=255 time=71.4 ms
64 bytes from 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f: icmp_seq=5 ttl=255 time=319 ms
^C
--- 2001:16b8:457f:b900:fec2:3dff:fe0d:2d1f ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4005ms
rtt min/avg/max/mdev = 32.825/236.519/629.671/219.849 ms
% ping 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4
PING 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4(2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4) 56 data bytes
From 2001:16b8:457f:b900:de39:6fff:fe6a:6980 icmp_seq=1 Destination unreachable: No route
From 2001:16b8:457f:b900:de39:6fff:fe6a:6980 icmp_seq=2 Destination unreachable: No route
From 2001:16b8:457f:b900:de39:6fff:fe6a:6980 icmp_seq=3 Destination unreachable: No route
From 2001:16b8:457f:b900:de39:6fff:fe6a:6980 icmp_seq=4 Destination unreachable: No route
^C
--- 2001:16b8:457f:b9f4:e4ea:aff8:af5d:eae4 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3058ms
Versions
RIOT master (8a7f3ab)
I just realized that this is a duplicate of #14676 with a less elaborate setup process.