IP Spoof messages

[N0ktar]

Over the past couple of months I noticed a sharp increase in "deny IP spoof" messages in my logs.
Should I be concerned? Are you getting a lot of these messages as well? They show up at a rate of 10-15 messages a minute.
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.XXX on interface outside
106023: Deny tcp src outside:200.163.246.65/2397 dst inside:205.XXX.XXX.XXX/3127 by access-
group "100

 

[N0ktar]

106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.102 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.102 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.101 on interface outside
106023: Deny udp src inside:192.168.2.104/123 dst outside:172.202.37.81/123 by a
p "inside"
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.99 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.114 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.106 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.100 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.100 on interface outside
106016: Deny IP spoof from (127.0.0.1) to 205.XXX.XXX.106 on interface outside