I just compressed a recent log from one of our Apache servers with WinZip. 2,995,170 bytes in, 87,252 bytes out, ratio 97%.
A typical line in the log is
Quote:
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[ip address removed] - [userid removed] [13/May/2012:20:01:08 -0400] "PROPFIND /svn-repos/Main/!svn/vcc/default HTTP/1.1" 207 414
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As there is usually a blast of lines for access in a row, the time stamps, ip addresses, userids and urls are quite similar and very compressable.
All that notwithstanding, typical consumer routers don't run Apache.