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5-6 Firmware User Guide
that will be used to generate key material for IKE Phase 1.
■ The Encryption Algorithm pop-up menu specifies the IKE Phase 1 encryption algorithm, and may be either
DES (the default) or 3DES.
■ The Hash Algorithm pop-up menu specifies the IKE Phase 1 hash algorithm, and may be either SHA1 (the
default) or MD5.
■ The Diffie-Hellman Group pop-up menu specifies the IKE Phase 1 Diffie-Hellman key exchange size, and
may be either Group 1 (768 bits), Group 2 (1024 bits) (the default), or Group 5 (1536 bits).
■ If you select Advanced IKE Phase 1 Options the Advanced IKE Phase 1 Options screen appears.
Normally it is not necessary to change the settings of the items on the Advanced IKE Phase 1 Options screen.
Most of these settings exist for ensuring compatibility with remote IKE implementations that may have certain
limitations.
■ The Negotiation pop-up menu allows you to specify the way the device will respond to a connection
attempt. Normal (the default) is a two-way mode; Initiate Only or Respond Only permit limiting the
connection to one-way only.
■ The SA Use Policy pop-up menu specifies the policy that the router will use to determine which Phase 1
SAs to use when multiple valid Phase 1 SAs are available for transmitting traffic on an IPsec tunnel.
Because the router normally re–keys prior to the expiration of the current Phase 1 SAs, multiple valid
Phase 1 SAs may exist during the period of time after the router has re-keyed and established new Phase
1 SAs and the time at which the old Phase 1 SAs expire.
■ If you select Newest SAs Immediately, the router will begin using the newly created Phase 1 SAs
immediately after they are negotiated.
■ If you select Old SAs Until Expired, the router will continue using the old Phase 1 SAs until they expire
and will begin using the newly created Phase 1 SAs only after the old ones are no longer valid.
■ Allow Dangling Phase 2 SAs toggles whether or not Phase 2 SAs are permitted to survive the expiration of
Advanced IKE Phase 1 Options
Negotiation... Normal
SA Use Policy... Newest SAs Immediately
Allow Dangling Phase 2 SAs: Yes
Phase 1 SA Lifetime (seconds): 28800
Phase 1 SA Lifetime (Kbytes): 0
Send Initial Contact Message: Yes
Include Vendor ID Payload: Yes
Independent Phase 2 Re-keys: Yes
Strict Port Policy: No
Return/Enter accepts * Tab toggles * ESC cancels.