20. The system of claim 17 wherein at least one predefined criterion is selected from a group comprising: a. criterion characterizing a relation between allowed traffic in the amended rule-set and traffic allowed in the initial rule-set; b. criterion characterizing a relation between entire added traffic and traffic which needs to be added in accordance with the unfitting connectivity request; c. criterion characterizing a relation between requested traffic rejected resulting from amendment and requested traffic allowed resulting from amendment; d. criterion characterizing a relation between requested traffic rejected resulting grom amendment and entire requested traffic; wherein the rule is considered as best matching if it fits at least one of said criteria and/or combination thereof.
20. The system of claim 17 wherein at least one predefined criterion is selected from a group comprising: a. criterion characterizing a relation between allowed traffic in the amended rule-set and traffic allowed in the initial rule-set; b. criterion characterizing a relation between entire added traffic and traffic which needs to be added in accordance with the unfitting connectivity request; c. criterion characterizing a relation between requested traffic rejected resulting from amendment and requested traffic allowed resulting from amendment; d. criterion characterizing a relation between requested traffic rejected resulting grom amendment and entire requested traffic; wherein the rule is considered as best matching if it fits at least one of said criteria and/or combination thereof. 21. The system of claim 20 further comprising automated searching for a plurality of rules enabling a predefined range of at least one of said criteria, and selecting the best matching rule among them.