option length exceeds option buffer length

Denis Taranushin tda at suttk.ru
Mon Dec 12 07:16:46 UTC 2016

I have a lot of errors in logs looks like:

Subscriber-ID: SV869_CV1549 HWAddress 3c:97:e:a5:83:20
DHCPREQUEST for from 3c:97:0e:a5:83:20 (Lenovo-PC) via
DHCPACK on to 3c:97:0e:a5:83:20 (Lenovo-PC) via
parse_option_buffer: malformed option ttk-su.<unknown> (code 104): 
option length exceeds option buffer length.

At that moment string "ttk-su.ru" appears  only in DHCPACK:
OPTION:  53 (  1) DHCP message type         5 (DHCPACK)
OPTION:  15 (  9) Domainname                ttk-su.ru

Why "option length exceeds option buffer length"?
Why the error appears only for some client and doesn't from others?

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