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Oracle Linux: Unable To Register Server on ULN With Timeouts And Network Packet Capture Logging: "(oui Unknown), ethertype Unknown (0x885a), length 60:" (Doc ID 2640416.1)

Last updated on MARCH 16, 2020

Applies to:

Linux OS - Version Oracle Linux 6.0 and later
Linux x86-64

Symptoms

A system running Oracle Linux 6 was unable to be registered using the the uln_register command.
The following error is seen:

"error : rhn-plugin: Error Communicating with Server."


Traceroutes to any external sites fail, with the traceroute stopping after reaching the gateway used by the server:

e.g.

# traceroute <HOST>
traceroute to <HOST> (<HOST IP>), 30 hops max, 60 byte packets
1  x.x.x.x (x.x.x.x)  0.258 ms  0.282 ms  0.307 ms
2  y.y.y.y (y.y.y.y)  1.080 ms  1.101 ms  1.093 ms
3  z.z.z.z (z.z.z.z)  2.223 ms  2.233 ms  2.238 ms
4  <GATEWAY HOST> (<GATEWAY IP>)  13.206 ms  13.181 ms  13.194 ms

5  * * *
6  * * *

A tcpdump capture shows the following messages logged on the network layer:

14:02:51.551540 STP 802.1d, Config, Flags [none], bridge-id 8037.<MAC ADDRESS>.8198, length 43
14:02:51.551974 IP <HOSTNAME>.ssh > <HOSTNAME>.60541: Flags [P.], seq 418338230:418338342, ack 3630848320, win 252, length 112
14:02:51.577289 <MAC ADDRESS> (oui Unknown) > <MAC ADDRESS> (oui Unknown), ethertype Unknown (0x885a), length 60:
  0x0000: 0102 001f 04c0 00ff 0102 748e f823 24c0 ..........t..#$.
  0x0010: 0100 0000 0000 0000 0000 0000 0000 0000 ................
  0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution


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