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. Rgds, Alex On 5/17/07, Stuart Henderson <[EMAIL PROTECTED]> wrote:
On 2007/05/17 18:02, Alex Berdan wrote: > I was curious about the GRE implementation on OpenBSD as in CISCO > there are keepalives Unfortunately, despite GRE being documented across a number of RFCs, there's no mention of this. Looks like it's probably a cisco- proprietary extension, I couldn't find any docs on packet formats or implementation. Have you come across any?
-- Alex
