On Tue, 2021-06-22 at 19:02 +0200, Olivier Cochard-Labbé wrote: > On Tue, Jun 22, 2021 at 5:17 PM Clemens Zauner <czau...@atnoc.net> > wrote: > > Hi Clemens, > indeed there is a problem somewhere, like a not synchronized RIB and > FIB. > > Could you display the output of those commands: > sysctl net.route.algo > netstat -4rnW | grep 51.15.0.0 > netstat -4onW | grep 51.15.0.0 >
[root@amarklor]/etc# netstat -4rnW | grep 51.15.0.0
51.15.0.0/17 149.6.174.241 UG1 8 1500 cxl0
51.15.0.0/16 149.6.174.241 UG1 8 1500 cxl0
[root@amarklor]/etc# netstat -4onW | grep 51.15.0.0
[root@amarklor]/etc#
Trace takes the 'wrong direction':
[root@amarklor]/etc# traceroute 51.15.183.144
traceroute to 51.15.183.144 (51.15.183.144), 64 hops max, 40 byte
packets
1 em2-910.panem.atnoc.net (193.239.188.36) 0.526 ms 0.255 ms 0.193
ms
I'm somehow lost, how the machine does that (btw: 193.239.188.36 is not
reachable via the chelsio, but via igb0, so there is not rewriting or
switching going on the the chelsio-T5.
BGP/FRR reflects the state of the kernel routing table:
amarklor.atnoc.net# sh ip route 51.15.183.144
Routing entry for 51.15.0.0/16
Known via "bgp", distance 20, metric 25061, best
Last update 01w1d22h ago
* 149.6.174.241, via cxl0, weight 1
amarklor.atnoc.net# sh ip bgp 51.15.0.0/16
BGP routing table entry for 51.15.0.0/16
Paths: (1 available, best #1, table default)
Advertised to non peer-group peers:
193.239.188.34 193.239.188.36 193.239.188.214 193.239.188.216
174 12876
149.6.174.241 (metric 1) from 149.6.174.241 (154.26.32.25)
Origin IGP, metric 25061, valid, external, best (First path
received)
Community: 174:21101 174:22008
Last update: Mon Jun 14 19:07:00 2021
amarklor.atnoc.net#
For what It's worth, for all prefixes displaying the behaviour, there
ist alsways a longer prefix for the same network in the routing-table.
As seen above: 51.15.0.0/16 and 51.15.0.0/17. But not all prefixes with
a more specific show this behaviour.
for instance:
[root@amarklor]/etc# netstat -4rnW | grep 88.10..0.0
88.100.0.0/15 149.6.174.241 UG1 8 1500 cxl0
88.100.0.0/14 149.6.174.241 UG1 8 1500 cxl0
88.102.0.0/16 149.6.174.241 UG1 8 1500 cxl0
88.104.0.0/14 149.6.174.241 UG1 8 1500 cxl0
88.104.0.0/13 149.6.174.241 UG1 8 1500 cxl0
88.108.0.0/14 149.6.174.241 UG1 8 1500 cxl0
or:
[root@amarklor]/etc# netstat -4rnW | grep 149.12.0.0
149.12.0.0/20 149.6.174.241 UG1 8 1500 cxl0
149.12.0.0/15 149.6.174.241 UG1 8 1500 cxl0
The 'netstat -4onW' is rather compact, I post the whole, for reference:
[root@amarklor]/etc# netstat -4onW
Nexthop data
Internet:
Idx Type IFA Gateway Flags Use Mtu
Netif Addrif Refcnt Prepend
1 v4/resolve 127.0.0.1 lo0/resolve H 76508 16384
lo0 2
2 v4/resolve 193.239.188.197 lo1/resolve H 0 16384
lo1 2
3 v4/resolve 149.6.174.242 cxl0/resolve 192653 1500
cxl0 3
4 v4/resolve 127.0.0.1 lo0/resolve HS 0 16384
lo0 cxl0 2
5 v4/gw 127.0.0.1 127.0.0.1 G1B 3546 16384
lo0 7
6 v4/resolve 193.239.188.38 igb0/resolve 2893089 1500
igb0 5
7 v4/resolve 127.0.0.1 lo0/resolve HS 0 16384
lo0 igb0 2
8 v4/gw 149.6.174.242 149.6.174.241 G1 176047 1500
cxl0 598127
9 v4/resolve 193.239.188.217 igb2/resolve 709843 9216
igb2 3
10 v4/resolve 127.0.0.1 lo0/resolve HS 0 16384
lo0 igb2 2
11 v4/resolve 193.239.188.215 igb3/resolve 708796 9216
igb3 3
12 v4/resolve 127.0.0.1 lo0/resolve HS 0 16384
lo0 igb3 2
13 v4/resolve 95.129.200.114 vlan960/resolve 2450 1500
vlan960 2
14 v4/resolve 127.0.0.1 lo0/resolve HS 0 16384
lo0 vlan960 2
15 v4/gw 95.129.200.114 95.129.200.123 G1 0 1500
vlan960 4
16 v4/gw 95.129.200.114 95.129.200.118 G1 0 1500
vlan960 5
17 v4/gw 95.129.200.114 95.129.200.124 G1 32 1500
vlan960 3
18 v4/gw 193.239.188.215 193.239.188.214 G1 54272925 9216
igb3 7
19 v4/gw 95.129.200.114 95.129.200.113 GH1 3 1500
vlan960 2
20 v4/gw 95.129.200.114 95.129.200.117 G1 95310 1500
vlan960 14
21 v4/gw 95.129.200.114 95.129.200.120 G1 0 1500
vlan960 8
22 v4/gw 95.129.200.114 95.129.200.117 GH1 0 1500
vlan960 7
23 v4/gw 95.129.200.114 95.129.200.125 G1 3613 1500
vlan960 35
24 v4/gw 95.129.200.114 95.129.200.119 G1 0 1500
vlan960 2
25 v4/gw 193.239.188.215 193.239.188.214 GH1 2662 9216
igb3 4
26 v4/gw 193.239.188.217 193.239.188.216 G1 98212 9216
igb2 4
27 v4/gw 193.239.188.217 193.239.188.216 GH1 1895 9216
igb2 5
28 v4/gw 193.239.188.38 193.239.188.34 G1 31251 1500
igb0 154517
29 v4/gw 193.239.188.38 193.239.188.36 G1 16214 1500
igb0 79933
30 v4/gw 149.6.174.242 149.6.174.241 G1 177 1500
cxl0 2
HTH
Clemens.
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