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Ask the Expert- SD-WAN

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SG200-18 errors

Im receiving these errors every few minutes for a week until the switch locks up and i have to reboot.

 %DHCPV6CLIENT-E-ILLGLOPTNLEN: Illegal option length: option is 24, length is 0, aggregated (4)

2 REPLIES 2
Hall of Fame Expert

Re: SG200-18 errors

Hello Jason,

option 24 refers to DNS domain list

see RFC 3646

https://tools.ietf.org/html/rfc3646

 

 

The format of the Domain Search List option is:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      OPTION_DOMAIN_LIST       |         option-len            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          searchlist                           |
      |                              ...                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   option-code:  OPTION_DOMAIN_LIST (24)

   option-len:   Length of the 'searchlist' field in octets

   searchlist:   The specification of the list of domain names in the
                 Domain Search List

   The list of domain names in the 'searchlist' MUST be encoded as
   specified in section "Representation and use of domain names" of RFC
   3315.

You should try to understand if any client is sending this offending packet to your switch.

Hope to help
Giuseppe

 

Re: SG200-18 errors

Its my Motorola cable modem. 

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