We are having with our local Cisco PIX 515, whereby the site to site VPN to our PIX appears to be breaking, and not re-establishing itself, every 36 hours or so.
Upon further inpsection, the symptom that we see is a slow reduction in the number of available size 1550 (Ethernet) blocks (as shown by the 'show blocks' command). This count slowly reduces from about 2000, to zero, over a period of a day or so, after which the VPN link breaks, and a router reboot is required. No other error or status messages of importance appear in the syslog output, and device free memory stays constant at around 32Mb. The depletion happens at a constant rate, even under negligible traffic conditions, with device CPU usage low, at around 1%.
The IOS is 7.0(5).
Thanks in advance for your help.