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[atlas] probe offline/lock up

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Bryan Fields

2020-07-05 19:55:06 CET

I had an interesting alert yesterday, as my probe 54858 said it was offline.
I was unable to ping it from the router port it's directly connected to, but
did some some traffic on the port via the counters.  There was a fresh ARP
entry as well.

I power cycled it and it came back online.  I was then able to ping it via v4
after it DHCP'd it's address.  v6 pings were working to it's SLAAC address
too.  It has not gone offline now, but I am noticing pings on v4 are not
working at all again.  v6 seems unaffected.

Is this normal or is there a problem with my probe?  I've never really taken
this close of a look before, I'm unsure if it has an issue or if this is normal.

Thanks,
-- 
Bryan Fields

727-409-1194 - Voice
http://bryanfields.net

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Philip Homburg

2020-07-06 12:00:25 CET

RIPE NCC staff member

On 2020/07/05 19:55 , Bryan Fields wrote:
> Is this normal or is there a problem with my probe?  I've never really taken
> this close of a look before, I'm unsure if it has an issue or if this is normal.

Do you see any ARP request coming from the probe? It seems that the
probe cannot reach it's default router on IPv4.

Philip

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Bryan Fields

2020-07-06 17:32:21 CET

On 7/6/20 6:00 AM, Philip Homburg wrote:
> On 2020/07/05 19:55 , Bryan Fields wrote:
>> Is this normal or is there a problem with my probe?  I've never really taken
>> this close of a look before, I'm unsure if it has an issue or if this is normal.
> 
> Do you see any ARP request coming from the probe? It seems that the
> probe cannot reach it's default router on IPv4.

Yes, it responds sometimes on v4, and always on v6.  I'm at a loss to
understand it.

v4:
> bfields@colo> ping 199.47.174.226 interface vlan.200 source 199.47.174.225    
> PING 199.47.174.226 (199.47.174.226): 56 data bytes
> 64 bytes from 199.47.174.226: icmp_seq=4 ttl=64 time=1.629 ms
> 64 bytes from 199.47.174.226: icmp_seq=35 ttl=64 time=1.622 ms
> 64 bytes from 199.47.174.226: icmp_seq=43 ttl=64 time=1.562 ms
> 64 bytes from 199.47.174.226: icmp_seq=51 ttl=64 time=1.728 ms
> 64 bytes from 199.47.174.226: icmp_seq=55 ttl=64 time=2.327 ms
> ^C
> --- 199.47.174.226 ping statistics ---
> 60 packets transmitted, 5 packets received, 91% packet loss
> round-trip min/avg/max/stddev = 1.562/1.774/2.327/0.282 ms

v6:
> ping 2605:900::1:9fff:fe04:f4a3 
> PING6(56=40+8+8 bytes) 2605:900::1 --> 2605:900::1:9fff:fe04:f4a3
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=0 hlim=64 time=3.098 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=1 hlim=64 time=6.471 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=2 hlim=64 time=2.898 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=3 hlim=64 time=1.367 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=4 hlim=64 time=1.320 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=5 hlim=64 time=1.864 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=6 hlim=64 time=1.415 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=7 hlim=64 time=2.624 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=8 hlim=64 time=2.308 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=9 hlim=64 time=2.577 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=10 hlim=64 time=2.605 ms
> 16 bytes from 2605:900::1:9fff:fe04:f4a3, icmp_seq=11 hlim=64 time=2.855 ms
> ^C
> --- 2605:900::1:9fff:fe04:f4a3 ping6 statistics ---
> 12 packets transmitted, 12 packets received, 0% packet loss
> round-trip min/avg/max/std-dev = 1.320/2.617/6.471/1.309 ms
ARP:
> bfields@colo> show arp no-resolve |match 199.47.174.226                       
> 02:01:9f:04:f4:a3 199.47.174.226  vlan.200                 none

MAC Table:
> show ethernet-switching table interface ge-0/0/6.0       
> Ethernet-switching table: 1 unicast entries
>   VLAN	      MAC address       Type         Age Interfaces
>   Atlas-Probe       *                 Flood          - All-members
>   Atlas-Probe       02:01:9f:04:f4:a3 Learn          0 ge-0/0/6.0



Interface:
> show interfaces ge-0/0/6                                        
> Physical interface: ge-0/0/6, Enabled, Physical link is Up
>   Interface index: 136, SNMP ifIndex: 514
>   Description: Server: Atlas Probe [1Mbit] (RIPE)
>   Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: Auto, Duplex: Auto, BPDU Error: None,
>   MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled,
>   Auto-negotiation: Enabled, Remote fault: Online, Media type: Copper
>   Device flags   : Present Running
>   Interface flags: SNMP-Traps Internal: 0x0
>   Link flags     : None
>   CoS queues     : 8 supported, 8 maximum usable queues
>   Current address: 78:19:f7:82:a1:09, Hardware address: 78:19:f7:82:a1:09
>   Last flapped   : 2020-07-04 11:42:33 EDT (1d 23:43 ago)
>   Input rate     : 4160 bps (6 pps)
>   Output rate    : 1296 bps (2 pps)
>   Active alarms  : None
>   Active defects : None
>   Interface transmit statistics: Disabled
> 
>   Logical interface ge-0/0/6.0 (Index 78) (SNMP ifIndex 515)
>     Flags: Up SNMP-Traps Redundancy-Device 0x0 Encapsulation: ENET2
>     Input packets : 7039008
>     Output packets: 32913928
>     Protocol eth-switch
>       Flags: None
> 


-- 
Bryan Fields

727-409-1194 - Voice
http://bryanfields.net