topic Transparent Firewall on Trunk Links in Network Security

Transparent Firewall on Trunk Links

tlienskt — Tue, 12 Mar 2019 06:32:53 GMT

Is it possible to have a Transparent Firewall on Trunk Link. I have 3 vlans.

Current

S1 3750 ------- S2 3750

trunk link passing 3 vlans

switchport trunk encapsulation dot1q
switchport mode trunk

S1 3750 ----- PIX515 ------ S2 3750

Please provide a sample config. Thanks!!

Yes it is possible. You will

Marius Gunnerud — Fri, 04 Sep 2015 21:57:38 GMT

Yes it is possible. You will however be limited to 8 that will be able to cross the ASA though. All you need to do is configure the trunk port on the switch, as you have provided in your configuration. Then on the ASA configure subinterfaces and BVI interface for each VLAN.

interface gig0/1

no shut

interface gig0/1.10

vlan 10

nameif INSIDE_1

security-level 100

bridge-group 10

interface gig0/1.20

vlan 20

nameif INSIDE_2

security-level 50

brige-group 20

interface bvi10

ip add 10.10.10.1 255.255.255.0

interface bvi 20

ip add 20.20.20.1 255.255.255.0

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When I try to assign the

tlienskt — Tue, 08 Sep 2015 15:16:48 GMT

When I try to assign the nameif to the 3rd sub interface. I get the following error.

ERROR: Maximum number of interfaces already configured.

Cisco PIX Security Appliance Software Version 7.2(2)
Device Manager Version 5.2(2)

Compiled on Wed 22-Nov-06 14:16 by builders
System image file is "flash:/image.bin"
Config file at boot was "startup-config"

PROS-PIX up 10 mins 17 secs

Hardware: PIX-515E, 64 MB RAM, CPU Pentium II 433 MHz
Flash E28F128J3 @ 0xfff00000, 16MB
BIOS Flash AM29F400B @ 0xfffd8000, 32KB

0: Ext: Ethernet0           : address is 0017.5aaf.9b2e, irq 10
1: Ext: Ethernet1           : address is 0017.5aaf.9b2f, irq 11
2: Ext: Ethernet2           : address is 000e.0ca9.68b6, irq 11

Licensed features for this platform:
Maximum Physical Interfaces : 3
Maximum VLANs               : 10
Inside Hosts                : Unlimited
Failover                    : Disabled
VPN-DES                     : Enabled
VPN-3DES-AES                : Enabled
Cut-through Proxy           : Enabled
Guards                      : Enabled
URL Filtering               : Enabled
Security Contexts           : 0
GTP/GPRS                    : Disabled
VPN Peers                   : Unlimited

This platform has a Restricted (R) license.

What license do you have

Marius Gunnerud — Tue, 08 Sep 2015 15:17:27 GMT

What license do you have installed on the ASA?

could you post your configuration please.

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I posted the license above

tlienskt — Tue, 08 Sep 2015 15:19:55 GMT

I posted the license above and it is a PIX not a ASA.

Maximum Physical Interfaces :

Marius Gunnerud — Tue, 08 Sep 2015 15:46:25 GMT

Maximum Physical Interfaces : 3

You need to upgrade your license so you can configure more interfaces. If you have 3 VLANs you will need 6 interfaces and 6 VLANs. YOu need a different VLAN because you are not able to configure the same VLAN on more than 1 interface.

PIX licenses are no longer sold, so you will have to upgrade to an ASA if you need to get this working.

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OK so I got the ASA running.

tlienskt — Thu, 19 Nov 2015 15:44:16 GMT

OK so I got the ASA running. Still having issues. NO traffic is being passed. Below is the config.

ASA Version 9.1(6)8
!
firewall transparent

names
!
interface Ethernet0/0
no nameif
no security-level
!
interface Ethernet0/0.1
vlan 1
nameif outside1
bridge-group 1
security-level 0
!
interface Ethernet0/0.110
vlan 110
nameif outside110
bridge-group 10
security-level 0
!
interface Ethernet0/0.192
vlan 192
nameif outside192
bridge-group 92
security-level 0
!
interface Ethernet0/1
no nameif
no security-level
!
interface Ethernet0/1.1
vlan 2
nameif inside1
bridge-group 1
security-level 100
!
interface Ethernet0/1.110
vlan 112
nameif inside110
bridge-group 10
security-level 100
!
interface Ethernet0/1.192
vlan 292
nameif inside192
bridge-group 92
security-level 100
!
interface Ethernet0/2
shutdown
no nameif
no security-level
!
interface Ethernet0/3
shutdown
no nameif
no security-level
!
interface Management0/0
management-only
shutdown
no nameif
no security-level
!
interface BVI1
ip address 10.7.1.251 255.255.255.0
!
interface BVI10
ip address 10.7.10.251 255.255.255.0
!
interface BVI92
ip address 192.168.4.251 255.255.255.0
!
ftp mode passive
access-list List extended permit ip any any
pager lines 24
mtu outside1 1500
mtu outside110 1500
mtu outside192 1500
mtu inside1 1500
mtu inside110 1500
mtu inside192 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
access-group Group out interface outside192
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 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
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
http server enable
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
no ssh stricthostkeycheck
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
!
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
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
no call-home reporting anonymous
Cryptochecksum:b7db95aafb0e7c0e9e1f7fadb0f28215
: end

Any help on this??

tlienskt — Thu, 19 Nov 2015 15:44:43 GMT

Any help on this??

sorry for the late reply.

Marius Gunnerud — Mon, 23 Nov 2015 08:09:31 GMT

sorry for the late reply.

You need to either add the command same-security-traffic permit inter-interface or add ACLs to the interfaces allowing the desired traffic.

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