I have IPsec VPN from my 1841 cisco router and the problem is that sometimes the VPN is not shown when i run teh command sh crypto isakmp sa, but i can ping the remote host on the remote network.Othertimes the VPN state is MM_NO_STATE, but still i can ping the other remote end.Why is this happening.i have added my sh ver of router below.
Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M),
Version 12.4(8), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Mon 15-May-06 13:52 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T8, RELEASE SOFTWARE (fc1)
UPS-Kems uptime is 2 weeks, 5 days, 5 hours, 17 minutes
System returned to ROM by reload at 02:30:08 UTC Tue Jun 21 2011
System image file is "flash:c1841-advipservices
This product contains cryptographic features and is subject to United
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use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
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Cisco 1841 (revision 7.0) with 116736K/14336K bytes of memory.
Processor board ID FCZ130692B8
2 FastEthernet interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity disabled.
191K bytes of NVRAM.
31360K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102