Cisco Firewall :: 3750 - How NAT Exempts Will Work
Feb 14, 2012
I've been use to managing our ASA's on firmware 8.2, however we have got a couple of ASA's on firmware 8.4 for a new project and the NAT area especially in the ASDM is very different now, I feel like I know nothing. On these new ASA's on 8.4 that will be in active/standy mode I will be creating a sub interfaces off these by attaching a 3750 and I wondered how the NAT exempts will work.
I will have to use exempts as I don't want the source IP to change when going from one interface to another in certain situations and this setup described works well on 8.2, but how can I do this on 8.4 as I don't even see the option for creating NAT exempts, looks like a different world?
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May 12, 2011
To lay it out, I recently installed 4 of these in a new office space. We have them connected to a 3750 stack....
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 54 WS-C3750X-48P 12.2(53)SE2 C3750E-UNIVERSALK9-M
2 54 WS-C3750X-48P 12.2(53)SE2 C3750E-UNIVERSALK9-M
3 52 WS-C3750-48P 12.2(53)SE2 C3750-IPBASEK9-M
[Code].....
as you may notice, port f5/0/36 is showing not conencted. This is the case even if I move this LWAP to one of the other 3 ports that are working or even a port on one of the other 3 switch models in the stack. I troubleshot without cross connects, I changed port configs, I changed cables, but I still do not get a link. The LWAP does get power though and will start to boot, but then the status light on the top will just blink orange. sounds like the LWAP is broken.. BUT - if I move this LWAP to a port on a 6513, it connects to the switch and links to the WLC just fine.
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May 15, 2013
I am attempting to get a NAT connection to work through a Sonicwall TZ200 to a VLAN defined on a Cisco 3750 switch. So far I have not been able to get it to work. I am able from the VLAN to access the internet and devices on another VLAN.
I have reviewed the configuration of the Sonicwall with Sonicwall support. They checked and see no issue with the configuration. I have the NAT gateway set to the vlan gateway IP address.
Are there any particular configuration options that I need to set on the 3750 switch in order to be able to route the traffic from the internet to the VLAN?
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Jan 9, 2013
I created the configuration below to limit the bandwidth, but doesn't work
Qos - 3750
!
mls qosmls qos map policed-dscp 10 to 8!class-map match-all Testmatch access-group name ACL!policy-map QOSdescription Limit 10M set ip dscp af11 police
[Code]....
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Apr 16, 2013
I have PC_A and PC_B connected to the same switch, and are put in the same vlan. PC_A is the master (source) and PC_B is the destination (client). IGMP Snooping is enabled by default.
Is there any reason why this should fail? There is no RP or any interface with PIM enabled. Its a flat network with a source and client in the same vlan...
IH-3750-LOADTEST-101#show ip igmp snooping vlan 724
Global IGMP Snooping configuration:
-------------------------------------------
IGMP snooping : Enabled
[Code].....
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May 30, 2013
I have 2 local accounts on a 3750 that kick in should radius be unavailable. If I log in as the admin account it gets priv 15, if I log in as the other user it gets privilege 3 which is correct, by my commands dont work, this is what I have added and the strange thing is I've dont this many times before on our other switches
username admin privilege 15 secret ***
username users privilege 3 secret ***
aaa new-model
[Code]....
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Apr 5, 2012
I have a 3750-48P when plugged in has fans that spin up, but no lights on the front of the chassis. Does this mean the power supply is bad? If its bad, why do the fans power up? Also, i am not receiving any data through the console.
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Jul 26, 2012
We are using the newest release of AD Agent (1.0.0.32.1, built 598). The ASA Firewalls 5520 are having the software release 8.4(3)8 installed.When somebody tries to connect thru the Identity based firewalls from a citrix published desktop environment (PDI) the connection is not possible. Checking the ip-of-user mapping on the firewalls (show user-identity ip-of-user USERNAME) mostly doesn't show the mapping of the USERNAME and the PDI the user is logged in. The user-of-ip mapping of the PDIs IP-address shows mostly other users, which then are used to authenticate the acces thru the firewalls.
What is interesting, that on the AD Agent using "adacfg.exe cache list | find /i "USERNAME"" i can't see the PDIs IP-address neither because it is mapped to another user.Is Citrix Published Desktop environment supported to connect thru Identity based Firewalls? How AD Agent, Domain Controllers and Firewalls are working together? On the firewalls with "show user-identity ad-agent we see, the following:
-Authentication Port: udp/1645
-Accounting Port: udp/1646
-ASA Listening Port: udp/3799
Why Cisco does use 1645 and 1646 and not 1812 and 1813?The Listening Port is used for what purpose? we tried the AD Agent modes full- download and on-demand with the same effect.
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Sep 21, 2012
I restarted my pix firewall cisco pix 515 and when i start it again the Act lamp and the firewall didn't work .
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Oct 4, 2011
I will be installing a new ASA 5510 firewall on our SIP vlan to separate our voice traffic from the rest of the traffic. I'm trying to decide whether or not I should go with an active/active setup or an active/standby. Any insight on the best way to set this up? This install is going in from scratch, and I am going to be connecting to a 3750 switch stack. Should I pair up a link from each switch to each 5510 using etherchannels? Should I use 8.3 or 8.4? Most of the docs I've been able to find say it depends on this, that, or the other.
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Oct 24, 2011
I have a rather large network with multiple VLANs and routing. Here's the layout:
5540 subinterface = gi0/2.18 = 10.16.18.1/24 TRUNKED to a 2960
2960 has an interface set to VLAN 18 (no IP) goes to a Cisco 4507 with an int. set to VLAN 18 (no IP)
4507 then has a trunk to a Cisco 7206
7206 then trunks to a Cisco 3845
3845 trunks to a 3750 (single)
3750 (single) trunks to a 3750 Stack
3750 Stack has int. set to VLAN 18 that goes to a 3750(lab) w/ int set to VLAN 18 w/ IP 10.16.18.251/24, VLAN502 = 10.202.255.1/30,
VLAN510 = 10.203.255.1/30
3750(lab) then has a trunk that connects to ASA 5510 w/ subinterfaces: e0/1.18 = 10.16.18.253/24, e0/1.510 = 10.203.255.2/30, e0/1.502 = 10.202.255.2/30
ASA5510 then goes to Internet
Any trunks are set to allow all VLANs. From the 2960 to the 3750 stack it's obviously all Layer 2 with trunking.
Issue:If I sit at the 5540, I can ping 10.16.18.251 and .253 with no problems. I can also ping 10.203.255.1 with no problems. Problem is that I cannot get to the other subinterfaces on the 5510 for VLANs 502 and 510. How do I ensure that my trunk is set up right? I have a route in the 5540 pointing to the 10.203 and 10.202 using the 10.16.18.251 address. It seems like a traceroute gets to the 10.16.18.251 address but then it stops. What route should be on the 5510 to make sure it gets back? The default route on the 5510 points to the Outside. I think it's something to do with the trunk that's just something I don't understand yet.
5510:
show int ip bri:
Ethernet0/1.18 10.16.18.253 YES manual up up
Ethernet0/1.502 10.202.255.2 YES manual up up
Ethernet0/1.510 10.203.255.2 YES manual up up
[code]....
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Jan 9, 2013
i have two CAT3750 need to place in L3, and it supposed that used as L3 switches by SVI for L2 routing, and I want to these two configured as redundancy by HSRP. but now I can only have one ASA5540 to connects these of L3 switches.
so, here is my questions:
1. does ASA5540 support multi vlan?
2. does it support spanning tree protocol?
3. if I've choiced to use trunking between two L3 switches, does it can pass through HSRP hello msg?
4. achive network redundancy
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Oct 6, 2012
We have a 3750 as core switch with critical oracle servers ( production & development ) connected to this. The goal is to have these servers behind a firewall, which is to be done by logically routing the traffic towards the device.Now, we need to connect the 3750 with two juniper srx firewall physically. The oracle server VLAN will be removed from 3750 and same layer 3 vlan will be created in the juniper firewall. How do i connect the 3750 to the two junipers. what configurations will be involved, on a logical basis.
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Jun 11, 2012
I am trying to enable Ftp traffic through our firewall at work. We have a Cisco 5505 ASA and we cannot access any Ftp servers outside our network. We are running 8.3(2). Any have commands I can run to allow us to connect to ftp sites?
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May 8, 2013
I am very new to Cisco ASA and I am trying many days to implement the design below but still cannot get it done. The situation I am facing is
- a host (e.g. 192.168.5.10) under Inside interface can contact to outside without any problem.
- however a host outside (e.g. in VLAN1 or outside this network) cannot contact host under Inside interface. I am using PING test and always get Request Time Out. [code]
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Sep 30, 2012
We have Cisco ASA 5520 with csc ssm 10 (product ver. Trend Micro InterScan for Cisco CSC SSM 6.6.1125.0)in Web>Global settings> URL filtering > Rules > Communications and Search> Social Networking category is set to block during work time and allow during leisure time(see the attachement), but rule for this category won't work. I mean social networking sites are always remain allowed.
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Oct 9, 2011
I have an asa 5520 that works fine if you are using passive ftp and ftp inspection is on globally. It is not working for an active ftp session. I tried allowing all ports back to the external ip address of the internal client as a test and this did not work either.
Cisco Adaptive Security Appliance Software Version 8.0(3)
Device Manager Version 6.2(3)
policy-map Global_Policy
[Code].....
I read another article saying that this command needs to be on the asa "fixup protocol ftp 21"
If this is enabled will it show on the firewall? How do I enable it?
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Oct 28, 2012
I can't telnet from a host(Ubuntu 12.10) in our DMZ to an outside MX on port TCP 587. Inspection for ESMTP not enabled. Port 587 enabled for host in DMZ to any.
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Apr 17, 2011
I am having ASA 5520 with active/standby configured. Around 2 days ago, the ASA stopped responding & all of my websites stopped working. when i checked the failover status it said that failover is off. I had to manually turn the failover to start my traffic flow.During this time my secondary ASA was not responding. After some time, the primary stopped responding & secondary became active......to solve this i had to make the secondary unit as failover unit primary & the primary unit as failover unit secondary. i did get a log on ASA :-
“(Primary) Disabling Failover” with error message no.105001 which states the below:-
Error Message %PIX|ASA-1-105001: (Primary) Disabling failover.
Explanation In version 7.x and later, this message may indicate the following: failover has been automatically disabled because of a mode mismatch (single or multiple), a license mismatch (encryption or context), or a hardware difference (one unit has an IPS SSM installed, and its peer has a CSC SSM installed).(Primary) can also be listed as (Secondary) for the secondary unit.
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Sep 12, 2012
Cisco 3750 with IP Service Image 12.2.55, Trying to enable Web Authentication on Layer 3 interface:
!
ip auth-proxy name bp_auth_proxy http inactivity-time 60
!
interface GigabitEthernet1/0/5
no switchport
ip address 192.168.1.27 255.255.255.0
ip access-group 101 in
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May 21, 2011
I just completed a relocation of my core dtaa center network, whic included numerous vitualized servers, plus Cisco 3750 switches and ASA. The addressing did not change as this was internal to our overall network. After the move however some websites are not available. My first thought was a double NAT, but this does not seem to be the case.
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Dec 14, 2011
I am working on the exact same configuration as noted here [URL] that uses subinterfaces on the asa. I have two interfaces on my stacked 3750's configured as trunk ports (primary ASA on primary 3750 stack member, secondary ASA on secondary 3750 stack member).
My questions is what should the DG be configured on the 3750. Can I keep the 3750 in L2 or will I have to enable L3 routing? Should the VLAN interfaces be configured.
The port that the ASA is configured with has 3 subinterfaces on VLAN 100, 200, and 300.
The subinterfaces are G0/2.100, G0/2.200, and G0/2.300.I am in the middle of converting from 3 separate DMZ switches, each attached to their own port on the asa which is their default gateway to one physical port on the ASA broken into 3 subinterfaces which then connect to stacked 3750's. The stack will then have the 3 separate DMZs in actual separate VLANs.
My goal is to leave the default gateway for each dmz on the ASA so I don't have to modify other areas of the ASA config.
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Dec 18, 2011
Lets say I have the following topology.
DataCenter<---Etherchannel(2)-->BuildingB<---Etherchannel(2)--->BuildingA
There arer 3 stacks of 3750 at each building. The core switch/router in our network is at location B. The way it was originally setupis every L3 device has an ip address for each lan. So let's say we have VLAN 200 withnetwork 192.168.200.0/24. The DataCenter would be assigned (192.168.200.3), Building B would be assigned (192.168.200.1), and Building A would be assigned (192.168.200.2). I'm configuring the DC and BA to be L2 only and Building B to be the only real router in the network besides a few ASAs. When I ran a 'no ip address' on the vlan interface on Building A, the internet connectivity for 192.168.200.0 dies, but local connectivity is fine. After doing some research and troubleshooting, I found out that if I set the next hop on the ASA for the local networks for an IP address on building B everything works perfectly.
The way the routes on the ASA are setup for local networks are as follows.
All local networks have ip route localnetwork mask x.110.215.17. This address is the IP address of the inside interface on the ASA. Now, when I kill the IP address on the vlan interface on Building A internet connectivity goes down, while the next hop is still pointed to this address, BUT if I give it a next hop of the vlan interface ip address on B everything works fine. Now, I can easily fix this, I was just wondering why this is happening?
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Mar 6, 2013
I have a server on the inside of my network (with a internet Routable IP). It has been requested to me that people from the internet access port 80, and that is translated at the firewall to port 7080. I have set up a temp Access rule to allow access to 7080 from the outside and it is accessable. I am not sure what I am doing wrong, but I am tion from 80 not able to get the translato 7080 to work.
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Nov 14, 2011
I have one outside interface with global IP address 1.1.1.1 and two inside.Both inside interfaces restrict and non_restrict have private IP addresses.I tried to filter some URLs on PIX515 IOS 7.2, only on restrict interface but my filter does not work.I can access prohibited URL from restrict interface. What's wrong in my URL filtering?
Here is my config:
PIX Version 7.2(2)
!
hostname pixfirewall
enable password 8Ry2YjIyt7RRXU24 encrypted
names
[code]....
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Jun 3, 2013
A couple of weeks ago, one of our ASA 5505s failed, and Cisco TAC shipped out a replacement. I was on vacation, and my assistant worked with TAC to get our backed-up configuration restored to the new hardware. This backup was just a copy & paste of the "show start," rather than an export done from ASDM. Anyway, since I got back on vacation I was able to iron out all the wrinkles from the configuration restore, except one. The remote access VPN isn't quite working. This VPN is only used in emergencies, when I can't access that branch office's network via our WAN.
What's happening is that clients are getting "authentication failed" messages when connecting. On Windows, it's an error 691. The VPN is set to authentication against RADIUS (Microsoft IAS server). The IAS server reports that the connection and authentication is successful. AAA RADIUS authentication tests on the ASA succeed, as do authentication & authorization LDAP tests. Basically, everything was working fine before we swapped in the new hardware, and I've gone over the configuration with a fine-toothed comb to ensure nothing's changed -- but clearly, I'm missing something. The new ASA is otherwise operating perfectly.
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Nov 20, 2012
I have a problems with one SA520W.The LAN port don't work correctly. If i connect PC directly via ethernet cable (i try 2 different cable and 2 different PC) the DHCP don't assign an IP. If i reset to factory default and manual insert IP (192.168.75.1) don't work.
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Apr 9, 2012
I am planing to implement an ASA55100 in our network.I've never worked with an ASA5510 device, so i am not quiet sure how to place it correctly.The idea is the following:Current SituationNetwork with wireless access, everybody who's connected to the Wifi can access the resources.SSID = JUFCorp Desired Situation Network with only internet access, separate SSID -> JUFGuest Is this possible with this layout?PS: when i configure the ASA, i couldn't find an option where i can enter a default gateway. Is this supposed to be like this?So right now i can only access the management port when i'm in the same subnet.
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Oct 7, 2011
After enabling AAA FWSM lost opportunity telnet session. FWSM version 3.2(5). In the logs show that resets itself FWSM telnet session.
Conf.,aaa-server TACACS+ (management) host 192.2.151.111
key aaa authentication ssh console TACACS+ LOCAL
aaa authentication enable console TACACS+ LOCAL
aaa authentication telnet console TACACS+ LOCAL
[Code] .....
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Sep 1, 2011
I have a customer with an ASA5505 where it will not reply to SNMP polls from any source, i have followed the configuration guide [URL].at and tested another ASA in our internal network and i have that working fine on our LAN, here is the snmp and logging sections of the show-run on the ASA, it there anything obvious im missing to make the SNMP work on this device?
snmp-server host outside 203.XX.75.122 community XXXX
snmp-server host outside 203.XX.84.196 community XXXX
snmp-server host outside 203.XX.86.82 community XXXX
snmp-server host outside 82.XX.244.3 community XXX
[Code] .....
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Aug 12, 2012
I have two ASA 5515 configured as active / standby. I configured the failover and I checked for proper operation. But when I configured access rules and NAT, I realized that the failover does not work anymore: two interfaces, inside and outside, are "Unknow (Waiting)". The other LAN interface and management are "Normal (Monitored)." [code] It is possible that some access rule deny the communication between the two asa?
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Mar 7, 2012
Does the ASA5520 work with the newest version of h.323?
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Nov 30, 2012
I have a server in a network DMZ (IP 192.168.40.43) need to do discovery of other IP address to update the IPAM tool. It should not be done source NAT so I´m trying to use the configuration below with Policy NAT but isn´t working:
nameif ethernet1 inside security100
nameif ethernet5 dmz8 security55
!
ip address inside 10.56.12.93 255.255.252.0
[Code]....
It´s following message appears "% PIX-3-305005: No translation group found for icmp dmz8 srv: 192.168.40.43 dst inside: 10.38.36.50 (type 13, code 0)".
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