We need AES so I have just tried to upgrade one of our VPN routers. After the upgrade I have about 50% of packet loss through an IPSEC tunnel. The other side is a checkpoint Firewall.
old IOS: c3640-jk9s-122-23.bin new IOS: c3640-ik9s-123-14.T7.bin
After downgrading to the old IOS, I had no more packet loss. So, the problem is related with the IOS. phase 1 and 2 are up, and I see no errors. Anybody an idea what could be the problem, or how to debug?