Обычно этому предшествует устновка сессии IPSec.
Значит, кто-то знает ключ PSK...
09:36:31 ipsec,info respond new phase 1 (Identity Protection): 1.1.1.1[500]<=>109.195.145.154[48618]
09:36:31 ipsec,info ISAKMP-SA established 1.1.1.1[4500]-109.195.145.154[43664] spi:3243e50ebcf0e8da:90ff559cb63f8cfc
09:36:31 l2tp,info first L2TP UDP packet received from 109.195.145.154
09:36:31 l2tp,ppp,info,account klamas logged in, 10.102.1.2
09:36:31 l2tp,ppp,info <l2tp-klamas>: authenticated
09:36:31 l2tp,ppp,info <l2tp-klamas>: connected1.1.1.1[500]<=>
109.195.145.154[48618]
09:36:31 ipsec,info ISAKMP-SA established
1.1.1.1[4500]-
109.195.145.154[43664] spi:3243e50ebcf0e8da:90ff559cb63f8cfc
09:36:31 l2tp,info first L2TP UDP packet received from
109.195.145.154 09:36:31 l2tp,ppp,info,account klamas logged in,
10.102.1.2 09:36:31 l2tp,ppp,info <l2tp-klamas>: authenticated
09:36:31 l2tp,ppp,info <l2tp-klamas>: connected