TCP out 64.233.161.99:80 in 192.168.18.52:46778 idle 0:00:00 Bytes 1657961 flags UIO
TCP out 209.104.39.15:80 in 192.168.18.34:52859 idle 0:06:34 Bytes 1026 flags UFRIO
TCP out 64.233.161.104:80 in 192.168.18.19:54409 idle 0:00:02 Bytes 498219 flags UIO
TCP out 209.104.39.15:80 in 192.168.18.22:52154 idle 0:00:01 Bytes 1000 flags UFRIO
TCP out 64.233.161.99:80 in 192.168.18.49:40441 idle 0:00:05 Bytes 60293 flags UIO
TCP out 64.233.161.147:80 in 192.168.18.49:41745 idle 0:00:05 Bytes 1557863 flags UIO

#!/usr/bin/python
outside = {} #store outside IP address
inside = {} #store inside IP address
for line in open("cisco.log"):
 	line = line.split()
 	out = line[2].split(":")[0] #get out IP address, stripping the port number
 	ins = line[4].split(":")[0] #get inside IP address, stripping the port number
 	if not outside.has_key(out): #if IP address hasn't been seen
 		outside[out] = 1 # initial count to 1
 	else:
 		outside[out] = outside[out] + 1 #add count

 	if not inside.has_key(ins):
 		inside[ins] = 1
 	else:
 		inside[ins] = inside[ins] + 1 #add count

print "Printing count of outside IPs ...." 
for i,k in outside.iteritems():
 	print "IP: %s , count: %d" % (i,k)

print "Printing count of inside IPs...." 	
for i,k in inside.iteritems():
 	print "IP: %s , count: %d" % (i,k)

Printing count of outside IPs....
IP : 64.233.161.99 , count: 2
IP : 64.233.161.147 , count: 1
IP : 209.104.39.15 , count: 2
IP : 64.233.161.104 , count: 1
Printing count of inside IPs....
IP: 192.168.18.52 , count: 1
IP: 192.168.18.34 , count: 1
IP: 192.168.18.49 , count: 2
IP: 192.168.18.22 , count: 1
IP: 192.168.18.19 , count: 1