topic Re: IPsec with internet access in Network Security

IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 09:38:39 GMT

Hi All

I have created IPsec tunnel from site A to site B and it is working fine and I can reach both ends but in site A I want to allow users to have internet access but unfortunately, I couldn't I did tried different ways of NAT but that is also didn't work

so here is the run configuration for the ASA can you please help me to find out what is the issue

Note: I can ping internet sites from the firewall and I removed the nat but still everything working fine for the IPsec tunnel

: Saved

:
: Serial Number: JAD213509RP
: Hardware: ASA5516, 8192 MB RAM, CPU Atom C2000 series 2416 MHz, 1 CPU (8 cores)
:
ASA Version 9.7(1)4
!
hostname Build-ASA
domain-name uk.global.spiraxsarco.com
enable password $sha512$5000$MF+JvS7koYTGIgZRv2j6mg==$1apzVaXyFjy5jqjN8/RSpA== pbkdf2
names

!
interface GigabitEthernet1/1
no nameif
security-level 0
no ip address
!
interface GigabitEthernet1/2
nameif mange
security-level 100
no ip address
!
interface GigabitEthernet1/3
nameif outside
security-level 0
ip address 5.148.97.249 255.255.255.224
!
interface GigabitEthernet1/4
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/5
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/6
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/7
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/8
nameif inside
security-level 100
no ip address
!
interface GigabitEthernet1/8.100
vlan 100
nameif VLAN100
security-level 100
ip address 192.168.50.9 255.255.255.252
!
interface GigabitEthernet1/8.200
vlan 200
nameif VLAN200
security-level 100
ip address 172.21.11.20 255.255.255.0
!
interface Management1/1
management-only
no nameif
no security-level
no ip address
!
interface Tunnel1
no nameif
no ip address
!
ftp mode passive
dns server-group DefaultDNS
domain-name uk.global.spiraxsarco.com
same-security-traffic permit intra-interface
object network BUILD-SW-172.21.11.0_24
subnet 172.21.11.0 255.255.255.0
object network SXS-172.20.0.0_16
subnet 172.20.0.0 255.255.0.0
object network BUILD-SW-192.168.50.8-30
subnet 192.168.50.8 255.255.255.252
object network Local-192.168.50.0_24
subnet 192.168.50.0 255.255.255.0
object-group network SPIRAX-NETS
network-object object SXS-172.20.0.0_16
object-group network LOCAL-NETS
network-object object BUILD-SW-172.21.11.0_24
network-object object BUILD-SW-192.168.50.8-30
access-list ACL extended permit udp host 81.145.54.250 eq isakmp any
access-list ACL extended permit gre host 81.145.54.250 any
access-list ACL extended permit esp host 81.145.54.250 any
access-list ACL extended permit udp any any eq isakmp
access-list ACL extended permit tcp any any eq ssh
access-list ACL extended permit udp any any eq 4500
access-list ACL extended deny ip any any log
access-list outside_cryptomap extended permit ip object-group LOCAL-NETS object-group SPIRAX-NETS
pager lines 24
logging enable
logging buffer-size 52428800
logging buffered informational
logging asdm informational
mtu outside 1500
mtu mange 1500
mtu inside 1500
mtu VLAN100 1500
mtu VLAN200 1500
no failover
no monitor-interface service-module
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
arp rate-limit 16384
route outside 0.0.0.0 0.0.0.0 5.148.97.225 1
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 sctp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
timeout conn-holddown 0:00:15
timeout igp stale-route 0:01:10
user-identity default-domain LOCAL
http server enable
http 192.168.1.0 255.255.255.0 mange
no snmp-server location
no snmp-server contact
service sw-reset-button
crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec security-association pmtu-aging infinite
crypto map outside_map1 1 match address outside_cryptomap
crypto map outside_map1 1 set pfs group5
crypto map outside_map1 1 set peer 81.145.54.250
crypto map outside_map1 1 set ikev1 transform-set ESP-AES-256-SHA
crypto map outside_map1 1 set reverse-route
crypto map outside_map1 interface outside
crypto ca trustpoint _SmartCallHome_ServerCA
no validation-usage
crl configure
crypto ca trustpool policy
crypto ca certificate chain _SmartCallHome_ServerCA
certificate ca 18dad19e267de8bb4a2158cdcc6b3b4a
308204d3 308203bb a0030201 02021018 dad19e26 7de8bb4a 2158cdcc 6b3b4a30
0d06092a 864886f7 0d010105 05003081 ca310b30 09060355 04061302 55533117
30150603 55040a13 0e566572 69536967 6e2c2049 6e632e31 1f301d06 0355040b
13165665 72695369 676e2054 72757374 204e6574 776f726b 313a3038 06035504
0b133128 63292032 30303620 56657269 5369676e 2c20496e 632e202d 20466f72
20617574 686f7269 7a656420 75736520 6f6e6c79 31453043 06035504 03133c56
65726953 69676e20 436c6173 73203320 5075626c 69632050 72696d61 72792043
65727469 66696361 74696f6e 20417574 686f7269 7479202d 20473530 1e170d30
36313130 38303030 3030305a 170d3336 30373136 32333539 35395a30 81ca310b
30090603 55040613 02555331 17301506 0355040a 130e5665 72695369 676e2c20
496e632e 311f301d 06035504 0b131656 65726953 69676e20 54727573 74204e65
74776f72 6b313a30 38060355 040b1331 28632920 32303036 20566572 69536967
6e2c2049 6e632e20 2d20466f 72206175 74686f72 697a6564 20757365 206f6e6c
79314530 43060355 0403133c 56657269 5369676e 20436c61 73732033 20507562
6c696320 5072696d 61727920 43657274 69666963 6174696f 6e204175 74686f72
69747920 2d204735 30820122 300d0609 2a864886 f70d0101 01050003 82010f00
3082010a 02820101 00af2408 08297a35 9e600caa e74b3b4e dc7cbc3c 451cbb2b
e0fe2902 f95708a3 64851527 f5f1adc8 31895d22 e82aaaa6 42b38ff8 b955b7b1
b74bb3fe 8f7e0757 ecef43db 66621561 cf600da4 d8def8e0 c362083d 5413eb49
ca595485 26e52b8f 1b9febf5 a191c233 49d84363 6a524bd2 8fe87051 4dd18969
7bc770f6 b3dc1274 db7b5d4b 56d396bf 1577a1b0 f4a225f2 af1c9267 18e5f406
04ef90b9 e400e4dd 3ab519ff 02baf43c eee08beb 378becf4 d7acf2f6 f03dafdd
75913319 1d1c40cb 74241921 93d914fe ac2a52c7 8fd50449 e48d6347 883c6983
cbfe47bd 2b7e4fc5 95ae0e9d d4d143c0 6773e314 087ee53f 9f73b833 0acf5d3f
3487968a ee53e825 15020301 0001a381 b23081af 300f0603 551d1301 01ff0405
30030101 ff300e06 03551d0f 0101ff04 04030201 06306d06 082b0601 05050701
0c046130 5fa15da0 5b305930 57305516 09696d61 67652f67 69663021 301f3007
06052b0e 03021a04 148fe5d3 1a86ac8d 8e6bc3cf 806ad448 182c7b19 2e302516
23687474 703a2f2f 6c6f676f 2e766572 69736967 6e2e636f 6d2f7673 6c6f676f
2e676966 301d0603 551d0e04 1604147f d365a7c2 ddecbbf0 3009f343 39fa02af
33313330 0d06092a 864886f7 0d010105 05000382 01010093 244a305f 62cfd81a
982f3dea dc992dbd 77f6a579 2238ecc4 a7a07812 ad620e45 7064c5e7 97662d98
097e5faf d6cc2865 f201aa08 1a47def9 f97c925a 0869200d d93e6d6e 3c0d6ed8
e6069140 18b9f8c1 eddfdb41 aae09620 c9cd6415 3881c994 eea28429 0b136f8e
db0cdd25 02dba48b 1944d241 7a05694a 584f60ca 7e826a0b 02aa2517 39b5db7f
e784652a 958abd86 de5e8116 832d10cc defda882 2a6d281f 0d0bc4e5 e71a2619
e1f4116f 10b595fc e7420532 dbce9d51 5e28b69e 85d35bef a57d4540 728eb70e
6b0e06fb 33354871 b89d278b c4655f0d 86769c44 7af6955c f65d3208 33a454b6
183f685c f2424a85 3854835f d1e82cf2 ac11d6a8 ed636a
quit
crypto ikev1 enable outside
crypto ikev1 am-disable
crypto ikev1 policy 1
authentication pre-share
encryption aes-256
hash sha
group 5
lifetime 28800
telnet 0.0.0.0 0.0.0.0 mange
telnet timeout 60
ssh stricthostkeycheck
ssh 0.0.0.0 0.0.0.0 mange
ssh timeout 60
ssh version 2
ssh cipher encryption high
ssh cipher integrity high
ssh key-exchange group dh-group1-sha1
console timeout 0
dhcpd auto_config outside
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
group-policy DfltGrpPolicy attributes
vpn-tunnel-protocol ikev1
dynamic-access-policy-record DfltAccessPolicy
tunnel-group 81.145.54.250 type ipsec-l2l
tunnel-group 81.145.54.250 ipsec-attributes
ikev1 pre-shared-key *****
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
no tcp-inspection
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
!
service-policy global_policy global
prompt hostname context
call-home reporting anonymous
Cryptochecksum:c8f2e0765e3fbe638a3d494a63de3b18
: end
Build-ASA#

Re: IPsec with internet access

Rob Ingram — Thu, 27 Feb 2020 10:23:12 GMT

Hi, Do you want to allow access to the internet over the VPN tunnel or just from the local ASA?

If you just need internet access from the local ASA, then use the follow example for NAT:-

This example NATs traffic from networks in the object LOCAL-NETS

nat (INSIDE,OUTSIDE) after-auto source dynamic LOCAL-NETS interface

This ensures that traffic over the VPN is not NATTED by the rule above
nat (INSIDE,OUTSIDE) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp

HTH

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 10:38:33 GMT

I did that but when I add nat (INSIDE,OUTSIDE) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp

it stops the VPN connection so that is my problem

Re: IPsec with internet access

Rob Ingram — Thu, 27 Feb 2020 10:48:20 GMT

Add both of those commands, then provide me the output of "show nat detail".

It is important the dynamic nat rule is below the other nat rule, which is why it has the command after-auto.

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 11:00:16 GMT

here is the outcome

Manual NAT Policies (Section 1)
1 (inside) to (outside) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp
translate_hits = 0, untranslate_hits = 0
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, Translated: 172.21.11.0/24, 192.168.50.8/30
Destination - Origin: 172.20.0.0/16, Translated: 172.20.0.0/16

Manual NAT Policies (Section 3)
1 (inside) to (outside) source dynamic LOCAL-NETS interface
translate_hits = 0, untranslate_hits = 0
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, Translated: 5.148.97.249/27

Re: IPsec with internet access

Rob Ingram — Thu, 27 Feb 2020 11:10:55 GMT

Ok, it looks like you have sub interfaces, with unique nameif - vlan100 and vlan200.

Modify your nat rules and change nameif of inside to vlan100 and then duplicate the rule for vlan200.

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 11:19:28 GMT

I'm sorry can please explain more what you mean

Modify your nat rules and change nameif of inside to vlan100 and then duplicate the rule for vlan200.

and thank you for your help

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 11:27:48 GMT

sorry I understand now it is working fine thanks a lot you saved my day

Manual NAT Policies (Section 1)
1 (inside) to (outside) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp
translate_hits = 4, untranslate_hits = 11
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, Translated: 172.21.11.0/24, 192.168.50.8/30
Destination - Origin: 172.20.0.0/16, Translated: 172.20.0.0/16

Manual NAT Policies (Section 3)
1 (VLAN100) to (outside) source dynamic LOCAL-NETS interface
translate_hits = 0, untranslate_hits = 0
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, Translated: 5.148.97.249/27
2 (VLAN200) to (outside) source dynamic LOCAL-NETS interface
translate_hits = 151, untranslate_hits = 4
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, Translated: 5.148.97.249/27
Build-ASA#

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 11:42:43 GMT

unfortunately, it did work for 5 minutes but then the VPN connection has gone can you help me to find what is the issue?

Re: IPsec with internet access

Rob Ingram — Thu, 27 Feb 2020 11:44:01 GMT

Ok, glad I could help resolve this for you.

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 11:51:26 GMT

I'm sorry to say it works for 5 minutes and now I can't reach the other end of VPN

Re: IPsec with internet access

Rob Ingram — Thu, 27 Feb 2020 11:59:29 GMT

You didn't appear to modify the NAT exempt rule for the VPN traffic

no nat (INSIDE,OUTSIDE) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp 


nat (VLAN100,OUTSIDE) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp 
nat (VLAN200,OUTSIDE) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 12:09:16 GMT

Manual NAT Policies (Section 1)
1 (VLAN100) to (outside) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp
translate_hits = 65, untranslate_hits = 65
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, 192.168.50.0/24, Translated: 172.21.11.0/24, 192.168.50.8/30, 192.168.50.0/24
Destination - Origin: 172.20.0.0/16, Translated: 172.20.0.0/16
2 (VLAN200) to (outside) source static LOCAL-NETS LOCAL-NETS destination static SPIRAX-NETS SPIRAX-NETS no-proxy-arp
translate_hits = 10, untranslate_hits = 10
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, 192.168.50.0/24, Translated: 172.21.11.0/24, 192.168.50.8/30, 192.168.50.0/24
Destination - Origin: 172.20.0.0/16, Translated: 172.20.0.0/16

Manual NAT Policies (Section 3)
1 (VLAN100) to (outside) source dynamic LOCAL-NETS interface
translate_hits = 0, untranslate_hits = 0
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, 192.168.50.0/24, Translated: 5.148.97.249/27
2 (VLAN200) to (outside) source dynamic LOCAL-NETS interface
translate_hits = 666, untranslate_hits = 12
Source - Origin: 172.21.11.0/24, 192.168.50.8/30, 192.168.50.0/24, Translated: 5.148.97.249/27
Build-ASA# nat (VLAN200,outside) source static LOCAL-NETS LOCAL-NETS destinati$

nat (VLAN200,outside) source static LOCAL-NETS LOCAL-NETS destination static SPI ^RAX-NETS SPIRAX-NETS no-proxy-arp

Re: IPsec with internet access

MohammedNaim3234 — Thu, 27 Feb 2020 12:49:02 GMT

can you check the out come after I done the vpn nat