[strongSwan] IPSEC SA Dropping for no apparent reason

[Turnbough, Bradley E.]

We started having issues with a IPSEC B2B tunnel dropping.  When I issue the 'up' command, it brings the tunnel up, and provides me with the following info (sanitized for security).

hostname.belcan.com:root:/root>ipsec up business-sa-01
initiating Main Mode IKE_SA business-sa-01[80] to e.f.g.h
generating ID_PROT request 0 [ SA V V V V ]
sending packet: from a.b.c.d[500] to e.f.g.h[500] (184 bytes)
received packet: from e.f.g.h[500] to a.b.c.d[500] (124 bytes)
parsed ID_PROT response 0 [ SA V V ]
received draft-ietf-ipsec-nat-t-ike-02\n vendor ID
received FRAGMENTATION vendor ID
generating ID_PROT request 0 [ KE No NAT-D NAT-D ]
sending packet: from a.b.c.d[500] to e.f.g.h[500] (244 bytes)
received packet: from e.f.g.h[500] to a.b.c.d[500] (304 bytes)
parsed ID_PROT response 0 [ KE No V V V V NAT-D NAT-D ]
received Cisco Unity vendor ID
received XAuth vendor ID
received unknown vendor ID: 7d:ca:d5:4e:05:4a:3e:5f:17:19:85:e5:b3:6c:bc:0e
received unknown vendor ID: 1f:07:f7:0e:aa:65:14:d3:b0:fa:96:54:2a:50:01:00
local host is behind NAT, sending keep alives
generating ID_PROT request 0 [ ID HASH ]
sending packet: from a.b.c.d[4500] to e.f.g.h[4500] (68 bytes)
received packet: from e.f.g.h[4500] to a.b.c.d[4500] (84 bytes)
parsed ID_PROT response 0 [ ID HASH V ]
received DPD vendor ID
IKE_SA business-sa-01[80] established between a.b.c.d[a.b.c.d]...e.f.g.h[e.f.g.h]
scheduling reauthentication in 10193s
maximum IKE_SA lifetime 10733s
generating QUICK_MODE request 2145900863 [ HASH SA No ID ID ]
sending packet: from a.b.c.d[4500] to e.f.g.h[4500] (204 bytes)
received packet: from e.f.g.h[4500] to a.b.c.d[4500] (164 bytes)
parsed QUICK_MODE response 2145900863 [ HASH SA No ID ID ]
connection 'business-sa-01' established successfully


Can someone please tell me if there is anything in there that is a problem or looks suspicious?

Thanks,

Brad Turnbough
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