Question

ASA 5510: default configuration

Asked by: ezjurgen

Dear,
I've a problem configuring my first cisco asa 5510 for business network, I've read a lot of documentation regarding this device, but my first simple configuration (passing all traffic from lan to wan, fails!). From what I've understand out of the documentation is that all trafic is allowed to pass over the firewall as it travels from a HIGHER to a LOWER security zone, so I've configured my interfaces with a security zone of 100 for my LAN interface and 0 for my WAN interface. When I ping from a client to the LAN interface itself I receive a ping back, but when I ping to the outside world (ping www.google.be) nothing is returned, I find that a bit strange as it should be working from higher security-levels to lower ones, below you find my running config.

ciscoasa(config)# sh ru
: Saved
:
ASA Version 7.0(8)
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
dns-guard
!
interface Ethernet0/0
 nameif WAN
 security-level 0
 ip address dhcp setroute
!
interface Ethernet0/1
 nameif LAN
 security-level 100
 ip address 192.168.1.254 255.255.255.0
!
interface Ethernet0/2
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Ethernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.100.254 255.255.255.0
 management-only
!
ftp mode passive
pager lines 24
logging asdm informational
mtu management 1500
mtu WAN 1500
mtu LAN 1500
no failover
no asdm history enable
arp timeout 14400
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd lease 3600
dhcpd ping_timeout 50
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map global_policy
 class inspection_default
  inspect dns maximum-length 512
  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
!
service-policy global_policy global
Cryptochecksum:518da311d7534eb83b1774f8b2507e73
: end

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Asked On: 2009-10-03 at 12:01:15ID24782721
Tags: Asa
,; Cisco
,; 5510
Topics: Networking Hardware Firewalls
,; Miscellaneous Networking
,; Cisco PIX Firewall
Participating Experts: 3
Points: 125
Comments: 16

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Answers

by: ikalmarPosted on 2009-10-03 at 12:04:09ID: 25486469

Hi, it seems that you missed nat

by: ikalmarPosted on 2009-10-03 at 12:05:33ID: 25486478

global (WAN) 1 interface
nat (LAN) 1 0.0.0.0 0.0.0.0

by: ezjurgenPosted on 2009-10-03 at 12:24:29ID: 25486584

OK thanks for that! I've entered that command and now I'm able to ping to an ip-address but is it normal that I cannot browse websites or ping to DNS name?

by: ikalmarPosted on 2009-10-03 at 12:36:05ID: 25486647

ok this is an dns error:

please set DNS server on your PC or use ASA for dhcp:

dhcpd auto_config WAN
dhcpd update dns both override
!
dhcpd address 192.168.1.2-192.168.1.25 LAN
dhcpd lease 10000 interface LAN
dhcpd ping_timeout 10 interface LAN
dhcpd domain xxx.xx interface LAN
dhcpd auto_config WAN interface LAN
dhcpd update dns both override interface inside
dhcpd enable LAN

by: lrmoorePosted on 2009-10-03 at 12:51:05ID: 25486725

Is your PC connecte to the LAN or to the designated Management port?
If trying to use the management port, it is designated management only, so you can't.
If on the LAN, then just check the DNS configuration on your PC and make sure you have a valid DNS server
Also, enable inspect icmp to help troubleshoot:

policy-map global_policy
class inspection_default
inspect icmp

by: ezjurgenPosted on 2009-10-03 at 12:53:37ID: 25486741

Thanks for that I've found that already myself, stupid !

by: ikalmarPosted on 2009-10-03 at 13:03:32ID: 25486793

I advise to read Pete webpage, there is a lot of good example:

http://www.petenetlive.com/Tech/techmain.htm

Best regards,
Istvan

by: ezjurgenPosted on 2009-10-03 at 13:34:16ID: 25486982

I've started from scratch because I was making a mess with all my try and errors, now configured the interfaces as below but now it isn't working anymore, I can't ping the outsite world, do I need to add some ACL's ?

ciscoasa# sh ru
: Saved
:
ASA Version 7.0(8)
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd VpEu/DBiUqr.VhG7 encrypted
names
dns-guard
!
interface Ethernet0/0
 nameif WAN
 security-level 0
 ip address dhcp setroute
!
interface Ethernet0/1
 nameif LAN
 security-level 100
 ip address 192.168.1.254 255.255.255.0
!
interface Ethernet0/2
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Ethernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.100.254 255.255.255.0
 management-only
!
ftp mode passive
pager lines 24
logging asdm informational
mtu WAN 1500
mtu LAN 1500
mtu management 1500
no failover
no asdm history enable
arp timeout 14400
global (WAN) 1 interface
nat (LAN) 1 0.0.0.0 0.0.0.0
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd lease 3600
dhcpd ping_timeout 50
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map global_policy
 class inspection_default
  inspect dns maximum-length 512
  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
!
service-policy global_policy global
Cryptochecksum:c182e4cd3b1095788d9c7383c0d94578
: end

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by: ezjurgenPosted on 2009-10-03 at 13:42:56ID: 25487014

Ok it seems that the ASA block ping requests by default!

by: rochey2009Posted on 2009-10-03 at 14:03:09ID: 25487099

Try this.

policy-map global_policy
class inspection_default
inspect icmp

by: rochey2009Posted on 2009-10-03 at 14:04:33ID: 25487106

Sorry Irmoore,

lrmoore suggested this earlier

policy-map global_policy
class inspection_default
inspect icmp

by: ezjurgenPosted on 2009-10-05 at 08:25:24ID: 25496129

Just one last question, today i've configured to firewall to accept outbound conenctions for mail, rdp etc (this are the UNTRUST_TO_TRUST acls) but now I'll create a TRUST_TO_UNTRUST acl where I want to block all smtp traffic, and only permit smtp traffic from the SERVEr (192.168.1.1), below you find my running config, but when I test this everything from the trust network is blockes also surfing the web, rdp, the strange thing is, when I connect to the server and telnet to a mailserver that connection is also blocked, does somebody have any idea how I can fix this, to allow all traffic from the trust network but only deny smtp traffic and allow it only from the serve r?

ciscoasa# sh ru
: Saved
:
ASA Version 7.0(8)
!
hostname ciscoasa
domain-name default.domain.invalid
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
dns-guard
!
interface Ethernet0/0
 nameif WAN
 security-level 0
 ip address dhcp setroute
!
interface Ethernet0/1
 nameif LAN
 security-level 100
 ip address 192.168.1.254 255.255.255.0
!
interface Ethernet0/2
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Ethernet0/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.100.254 255.255.255.0
 management-only
!
ftp mode passive
access-list UNTRUST_TO_TRUST extended permit tcp any interface WAN eq https
access-list UNTRUST_TO_TRUST extended permit tcp any interface WAN eq 3389
access-list UNTRUST_TO_TRUST extended permit tcp any interface WAN eq 987
access-list UNTRUST_TO_TRUST extended permit tcp A.B.C.D 255.255.255.240 interface WAN eq smtp
access-list UNTRUST_TO_TRUST extended permit tcp host A.B.C.D interface WAN eq smtp
access-list TRUST_TO_UNTRUST extended deny tcp any eq smtp any eq smtp inactive
pager lines 24
logging asdm informational
mtu WAN 1500
mtu LAN 1500
mtu management 1500
no failover
icmp deny any WAN
asdm image disk0:/asdm-508.bin
no asdm history enable
arp timeout 14400
global (WAN) 1 interface
nat (LAN) 1 0.0.0.0 0.0.0.0
static (LAN,WAN) tcp interface 3389 192.168.1.2 3389 netmask 255.255.255.255
static (LAN,WAN) tcp interface https 192.168.1.1 https netmask 255.255.255.255
static (LAN,WAN) tcp interface 987 192.168.1.1 987 netmask 255.255.255.255
static (LAN,WAN) tcp interface smtp 192.168.1.1 smtp netmask 255.255.255.255
access-group UNTRUST_TO_TRUST in interface WAN
access-group TRUST_TO_UNTRUST in interface LAN
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00
timeout mgcp-pat 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
http server enable
http 192.168.100.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd lease 3600
dhcpd ping_timeout 50
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map global_policy
 class inspection_default
  inspect dns maximum-length 512
  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
!
service-policy global_policy global
Cryptochecksum:96402391ae1f5bbca0f539c53c3e05a2
: end

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by: rochey2009Posted on 2009-10-05 at 08:37:49ID: 25496248

When you put the access-list on the inside interface there is an implicit deny at the end, so you need to permit other traffic.

access-list TRUST_TO_UNTRUST extended deny tcp any eq smtp any eq smtp inactive
access-list TRUST_TO_UNTRUST extended permit ip any any

by: ezjurgenPosted on 2009-10-05 at 12:30:45ID: 25498698

At which interface there's no implicit deny at the end ? or what's a best practise to achieve what I want, only allow smtp traffic to be passed to the outside from the server, and denied smtp from all clients, and for the rest everything must be possible!

by: rochey2009Posted on 2009-10-05 at 13:10:45ID: 25499153

Allow you smtp server to send mail

access-list TRUST_TO_UNTRUST extended permit tcp host 192.168.0.1 any eq smtp
access-list TRUST_TO_UNTRUST extended permit tcp host 192.168.0.1 eq smtp any

deny your clients to send smtp

access-list TRUST_TO_UNTRUST extended deny tcp any any eq smtp

permit everything else.

access-list TRUST_TO_UNTRUST extended permit ip any any
access-list TRUST_TO_UNTRUST extended permit icmp any any

apply the access-list to you inside interface in the in direction
access-group TRUST_TO_UNTRUST in interface LAN

by: ikalmarPosted on 2009-10-05 at 13:22:35ID: 25499293

anf after do 'clear xlate'

20120131-EE-VQP-002

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ASA 5510: default configuration

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Asa

Cisco

5510

Networking Hardware Firewalls

Miscellaneous Networking

Cisco PIX Firewall

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