На сайте Cisco есть такая страничка:
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008020b19e.shtml#error-msgs
Service Configuration Error Messages
Occasionally during bootup of Cisco hardware using Cisco IOS software, error messages appear similar to those below:
%Error opening tftp://255.255.255.255/network-confg (Socket error)
%Error opening tftp://255.255.255.255/cisconet.cfg (Socket error)
%Error opening tftp://255.255.255.255/3620-confg (Socket error)
%Error opening tftp://255.255.255.255/3620.cfg (Socket error)
These error messages are related to the default service configuration option built into Cisco IOS software which attempts to access the service configuration files from a network Trivial File Transfer Protocol (TFTP) server.
Solution
To disable this feature, enter the no service config global command.
Router#config terminal
Enter configuration commands, one per line.
Router(config)#no service config
Router(config)#exit
Router#copy running-config startup-config
At the next bootup of the router, the error messages should no longer appear.
НО!!!! Это объясняет как это удалить. И только.
А за [Попробуй echo 0 > /proc/sys/net/ipv4/conf/all/log_martians ] спасибо! Даже не думал, что в IOS такая глубокая иерархия.
PS Если я правильно понял, и это log-и в самой киске.