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MK.
Asked: 2011-08-26 13:54:08 +0800 CST

cisco asa NAT to site-to-site VPN

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I'm trying to NAT an external address to an internal address which is not local, but on a remote end of a site-to-site VPN connection. Is this possible? Log says Routing failed to locate next hop for TCP from outside x.x.x.x/xxx to inside:y.y.y.y/yyyy

I can connect to the y.y.y.y address just fine, so VPN is up.

nat (outside,outside) source static any any destination static web-server-outside web-server-inside service http tomcat-http
access-list outside_cryptomap extended permit object-group DM_INLINE_SERVICE_1 any object vpn-network 
access-list outside_access_in extended permit object-group DM_INLINE_SERVICE_2 any object-group DM_INLINE_NETWORK_2

object-group network DM_INLINE_NETWORK_2
 network-object object web-server-inside
 network-object object web-server-outside
object-group service DM_INLINE_SERVICE_2
 service-object tcp destination eq www 
 service-object tcp destination eq https 
 service-object object tomcat-http

Result of the command: "packet-tracer input outside tcp 8.8.8.8 1234 x.x.x.x 80 detailed"

Phase: 1
Type: UN-NAT
Subtype: static
Result: ALLOW
Config:
nat (outside,outside) source static any any destination static web-server-outside web-server-inside service http tomcat-http
Additional Information:
NAT divert to egress interface outside
Untranslate x.x.x.x/80 to 10.y.y.y/8080

Phase: 2
Type: ACCESS-LIST
Subtype: 
Result: DROP
Config:
Implicit Rule
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0xadc473e8, priority=111, domain=permit, deny=true
    hits=3395573, user_data=0x0, cs_id=0x0, flags=0x4000, protocol=0
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, dscp=0x0
    input_ifc=outside, output_ifc=outside

Result:
input-interface: outside
input-status: up
input-line-status: up
output-interface: outside
output-status: up
output-line-status: up
Action: drop
Drop-reason: (acl-drop) Flow is denied by configured rule

Here's trace after allowing intrainterface traffic:

    Result of the command: "packet-tracer input outside tcp 8.8.8.8 1234 x.x.x.x 80 detailed"

Phase: 1
Type: UN-NAT
Subtype: static
Result: ALLOW
Config:
nat (outside,outside) source static any any destination static web-server-outside web-server-inside service http tomcat-http
Additional Information:
NAT divert to egress interface outside
Untranslate x.x.x.x/80 to y.y.y.y/8080

Phase: 2
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group outside_access_in in interface outside
access-list outside_access_in extended permit object-group DM_INLINE_SERVICE_2 any object web-server-inside 
object-group service DM_INLINE_SERVICE_2
 service-object object http 
 service-object object http-tomcat 
 service-object object https 
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0xae825a98, priority=13, domain=permit, deny=false
    hits=16, user_data=0xaa5f12c0, cs_id=0x0, use_real_addr, flags=0x0, protocol=6
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=y.y.y.y, mask=255.255.255.255, port=8080, dscp=0x0
    input_ifc=outside, output_ifc=any

Phase: 3
Type: IP-OPTIONS
Subtype: 
Result: ALLOW
Config:
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0xadc4acf0, priority=0, domain=inspect-ip-options, deny=true
    hits=22335785, user_data=0x0, cs_id=0x0, reverse, flags=0x0, protocol=0
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, dscp=0x0
    input_ifc=outside, output_ifc=any

Phase: 4
Type: FOVER
Subtype: standby-update
Result: ALLOW
Config:
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0xadc42e48, priority=21, domain=lu, deny=true
    hits=8829, user_data=0x0, cs_id=0x0, flags=0x0, protocol=6
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=0.0.0.0, mask=0.0.0.0, port=80, dscp=0x0
    input_ifc=outside, output_ifc=any

Phase: 5
Type: VPN
Subtype: ipsec-tunnel-flow
Result: ALLOW
Config:
Additional Information:
 Forward Flow based lookup yields rule:
 in  id=0xad421098, priority=13, domain=ipsec-tunnel-flow, deny=true
    hits=22393564, user_data=0x0, cs_id=0x0, flags=0x0, protocol=0
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, dscp=0x0
    input_ifc=outside, output_ifc=any

Phase: 6
Type: NAT
Subtype: 
Result: ALLOW
Config:
nat (outside,outside) source static any any destination static web-server-outside web-server-inside service http tomcat-http
Additional Information:
Static translate 8.8.8.8/1234 to 8.8.8.8/1234
 Forward Flow based lookup yields rule:
 in  id=0xafd6da48, priority=6, domain=nat, deny=false
    hits=26, user_data=0xae843690, cs_id=0x0, use_real_addr, flags=0x0, protocol=6
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=y.y.y.y, mask=255.255.255.255, port=8080, dscp=0x0
    input_ifc=outside, output_ifc=outside

Phase: 7
Type: NAT
Subtype: rpf-check
Result: ALLOW
Config:
nat (outside,outside) source static any any destination static web-server-outside web-server-inside service http tomcat-http
Additional Information:
 Forward Flow based lookup yields rule:
 out id=0xae2c6960, priority=6, domain=nat-reverse, deny=false
    hits=26, user_data=0xae835d18, cs_id=0x0, use_real_addr, flags=0x0, protocol=6
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=y.y.y.y, mask=255.255.255.255, port=8080, dscp=0x0
    input_ifc=outside, output_ifc=outside

Phase: 8
Type: IP-OPTIONS
Subtype: 
Result: ALLOW
Config:
Additional Information:
 Reverse Flow based lookup yields rule:
 in  id=0xadc4acf0, priority=0, domain=inspect-ip-options, deny=true
    hits=22335787, user_data=0x0, cs_id=0x0, reverse, flags=0x0, protocol=0
    src ip/id=0.0.0.0, mask=0.0.0.0, port=0
    dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, dscp=0x0
    input_ifc=outside, output_ifc=any

Phase: 9
Type: FLOW-CREATION
Subtype: 
Result: ALLOW
Config:
Additional Information:
New flow created with id 23045025, packet dispatched to next module
Module information for forward flow ...
snp_fp_tracer_drop
snp_fp_inspect_ip_options
snp_fp_tcp_normalizer
snp_fp_translate
snp_fp_adjacency
snp_fp_fragment
snp_ifc_stat

Module information for reverse flow ...
snp_fp_tracer_drop
snp_fp_inspect_ip_options
snp_fp_translate
snp_fp_tcp_normalizer
snp_fp_adjacency
snp_fp_fragment
snp_ifc_stat

Result:
input-interface: outside
input-status: up
input-line-status: up
output-interface: outside
output-status: up
output-line-status: up
Action: allow
vpn firewall cisco-asa

0 Answers