On 2007/05/17 18:44, Alex Berdan wrote: > This is a nice feature which can be used in cases where you don't run > any dynamic routing protocol over GRE/IPSec tunnel. > If you have OpenBSD as VPN concentrator you can have SNMP traps when > the tunnel is down and take any action etc. > > Here is the CISCO implementation: > > http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087cec.html > > Hopefully someone will see this and eventually purpose a alternate > solution or implement keepalives in the distribution.
I already found some pages about how to turn it on in IOS, but they don't bother with any implementation details. Thanks to a kind person who contacted me offlist, I now know how the hack works: http://www.cisco.com/en/US/tech/tk827/tk369/technologies_tech_note09186a008040a17c.shtml#topic2
