gre_over_ipsec
R1 的配置如下:
!
crypto isakmp policy 1
encr 3des
authentication pre-share
group 2
lifetime 10000
crypto isakmp key cisco address 202.102.1.2
!
!
crypto ipsec transform-set benet-set esp-des esp-sha-hmac
!
crypto map benet-map 1 ipsec-isakmp
set peer 202.102.1.2
set transform-set benet-set
match address 100
!
!
interface Tunnel0
ip address 123.1.1.1 255.255.255.0
tunnel source Ethernet0/1
tunnel destination 202.102.1.2
!
Tunnel0 up的条件,在路由表中有到Tunnel0的路由,, Tunnel0本身有源和目的,源和目的可达.
interface Ethernet0/1
ip address 202.102.1.1 255.255.255.0
half-duplex
crypto map benet-map
!
!
router rip
version 2
network 1.0.0.0
network 2.0.0.0
network 3.0.0.0
network 123.0.0.0
no auto-summary
!
Network要宣告Tunnel0的IP和内网的IP,一定不要宣告物理口的IP
ip classless
ip route 0.0.0.0 0.0.0.0 202.102.1.2
ip http server
!
access-list 100 permit gre host 202.102.1.1 host 202.102.1.2
!
在这里加密202.102.1.1到202.102.1.2的GRE的流量,路由协议也加密了
加密图要用物理口,在这里用在Tunnel0口无任何意义
Peer是物理口,所有经过Tunnel0流量自动加解密,包括路由协议
r1#show crypto ipsec sa
interface: Ethernet0/1
Crypto map tag: benet-map, local addr. 202.102.1.1
local ident (addr/mask/prot/port): (202.102.1.1/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (202.102.1.2/255.255.255.255/47/0)
current_peer: 202.102.1.2
PERMIT, flags={origin_is_acl,parent_is_transport,}
#pkts encaps: 50, #pkts encrypt: 50, #pkts digest 50
#pkts decaps: 51, #pkts decrypt: 51, #pkts verify 51
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 1, #recv errors 0
local crypto endpt.: 202.102.1.1, remote crypto endpt.: 202.102.1.2
path mtu 1500, ip mtu 1500, ip mtu interface Ethernet0/1
current outbound spi: A531DDF7
inbound esp sas:
spi: 0x677E1AFE(1736317694)
transform: esp-des esp-sha-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 2000, flow_id: 1, crypto map: benet-map
sa timing: remaining key lifetime (k/sec): (4607991/2594)
IV size: 8 bytes
replay detection support: Y
在这里可以用传输模式(双方都要做),改变模式后并不是马上生效,需要(双方都要做)clear cry sa和clear cry sa
r1#clear crypto sa
r1#clear crypto sa
r1#show crypto ipsec sa
interface: Ethernet0/1
Crypto map tag: benet-map, local addr. 202.102.1.1
local ident (addr/mask/prot/port): (202.102.1.1/255.255.255.255/47/0)
remote ident (addr/mask/prot/port): (202.102.1.2/255.255.255.255/47/0)
current_peer: 202.102.1.2
PERMIT, flags={origin_is_acl,transport_parent,parent_is_transport,}
#pkts encaps: 3, #pkts encrypt: 3, #pkts digest 3
#pkts decaps: 3, #pkts decrypt: 3, #pkts verify 3
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 1, #recv errors 0
local crypto endpt.: 202.102.1.1, remote crypto endpt.: 202.102.1.2
path mtu 1500, ip mtu 1500, ip mtu interface Ethernet0/1
current outbound spi: 1BFA91B5
inbound esp sas:
spi: 0x13845588(327439752)
transform: esp-des esp-sha-hmac ,
in use settings ={Transport, }
slot: 0, conn id: 2000, flow_id: 1, crypto map: benet-map
sa timing: remaining key lifetime (k/sec): (4607999/3455)
IV size: 8 bytes
replay detection support: Y
r1#show crypto engine connections active
Over谁谁就在外边
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