Cisco Firewall :: SSH Key Exchange DH Group 14?
May 29, 2013
I am trying to issue command "ssh key-exchange group dhgroup14" on several of my ASA firewalls. The key-exchange command is failing on 3 of 4 ASA firewalls. According to Cisco documentation, this command was introducted in 8.4. My ASA's are running version 8.6.1.10, 9.1.1.8, 9.1.1.10 and 9.1.2. The command is available only with 9.1.2.
Example from one my ASA.
lbjinetfw# show version | in Version
Cisco Adaptive Security Appliance Software Version 8.6(1)10
Device Manager Version 7.1(2)
Baseboard Management Controller (revision 0x1) Firmware Version: 2.4
lbjinetfw# config t
lbjinetfw(config)# ssh
[code]....
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Nov 22, 2006
one of my router are scanned by Foundstone and get an alert :
""The SSH2 protocol specification requires that a SSH2 server support the diffie-hellman-group1-sha1 key exchange algorithm. This key exchange algorithm is considered strong, but faces a potential weakness in that the same prime number is used for all key exchanges."
SO wanna check if cisco SSH2 can support the diffie-hellman-exchange-group-sha1? If yes, which IOS version required?
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Nov 7, 2012
i have exchange with NLB cluster.
i want to PAT the cluster ip to access email from outside. i know i can add the static arp entry for multicast cluster ip.
my question is i can add static nat command to that same cluster ip for port 25 and 443 like normal way like we do for normal PAT?
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Feb 26, 2013
We have the following setup on our Cisco ASA version 8.6.1 One to one NAT rule from outside to our Exchange 2010 cluster IP address (DAG group). This is working fine for clients on the internet accessing their emails via Exchange using their phones. The ASA has the MAC address of the active node from the cluster but when the cluster failover it cache the IP address and are not updating the new MAC when the cluster failover. So users from the outside are unable to connect to the new node from outside the ASA as the MAC address from the passive node is in the MAC table. The MAC address on all the switches update within 2 seconds on the internal network and users don't notice any outage.
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Aug 16, 2011
We have a ASA5510 with a webserver in the DMZ network 10.2.2.0/24. We now want this web server to be able to access the Exchange server in the Inside network 10.1.1.0/24. I researched this and it seemed straight forward according the the Cisco document below:
[URL]
I'm looking to do this with smtp so I added these lines to the config:
static (inside,DMZ) 10.2.2.30 10.1.1.11 netmask 255.255.255.255
access-list dmz extended permit tcp host 10.2.2.2 host 10.2.2.30 eq smtp
The configuration line:access-group DMZ in interface DMZ Already existed in the configuration so didn't need to be re-entered.
ASA Version 8.0(4)
!
hostname xxxx
domain-name xxxx.com
enable password xxxxxxxxxxxx encrypted
passwd xxxxxxxxxxxxxx encrypted
names
[code]....
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Jun 15, 2011
I have the following scenario.
INET
(205.50.50.1)
|
|
(205.50.50.2)
[CISCO ASA 5540]
(10.10.10.1)
|
|
+ ---------------------------------------------+
(10.10.10.2) (10.10.10.3)
[BARRACUDA] [Exchange SRV]
Mail Domain: mail.domain.com (205.50.50.50)
Ok so the mail flows to the Barracuda using a static 1:1 NAT configuration and then gets delivered from the Barracuda to the Exchange server. I want to implement active sync (Direct Push) for Windows mobile devices. They need to communicate with mail.domain.com over port 443. The problem is I want mail to continue to flow to the Barracuda, but direct Direct Push traffic to the Exchange server.I cnow I can't implement two 1:1 NAT mappings from the same external hostname to 2 different servers.
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Aug 15, 2011
We have a ASA 5510 which was running 8.0.2, we recently upgraded it to 8.2.5 and since the upgrade remote users for exchange 2007 are not able to download any large email attachments(over or close to 1MB). This is only happening to Outlook anywhere users or OWA users who are connecting to the exchange server using https(443) externally. If the same users connects internally they do not face any issue. When i check the logs on ASA i am gettings lots of RESET-O and RESET-I entries. Looks like the connection between the client and the server gets reset.
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Jan 17, 2012
We are upgrading from a Pix 515e to a ASA 5510 with CSC SSM. We cannot send outbound email or receive any email from the outside world. I have placed a call with Cisco Support with no luck. [code]
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Jun 26, 2012
I am trying to port forwarding Exchange 2010 OWA using ASA5505, wherever I used object NAT or Twice NAT it just doesn't work.... here is my config:
access-list outside-access remark "Exchange Server Access Rules"
access-list outside-access extended permit tcp any host <public x.x.x.11> eq smtp
access-list outside-access extended permit tcp any host <public x.x.x.11> eq https
[code]...
note that i use public ip <public x.x.x.9> on the outside interface for PAT, so all hosts in the same private can access internet
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Nov 29, 2011
Our ASA 5510 has been in place for nearly two years, we never have any issue what so ever with it. All along the ASA has been using the default policy. Lately, we beeen getting email deferred in our Barracuda Spam firewall. Google quickly reveals that ESMTP does not play nice with Barracuda witch i disabled eventhough we haven't had any issue with it before. However, the issue remains, we still getting email deferred in the barracuda.
While doing more troubleshooting on the ASA, I constated when issue the command show local-host + IP of the Barracuda, there is an IP address in outside of the interface that can get up to 96 UDP port 53 connections with the Barracuda, this connection never get lower than 20! However, when checking the default setup for the Barracuda, i have the values below:
Incoming SMTP Timeout: 20
Message per SMTP Session : 8
Maximum SMTP Error SMTP Session: 2
Maximum Connection per Client 30m:40
My question is if that ASA show up to 96 DNS session with an outside host to my barracuda, won't that push the barracuda to play email deferred timeout ? Should I change the barracuda default setting? Or should i change the connections limits for the Barracuda in the ASA?
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May 8, 2012
I know that I've run into this before but I can't remember the fix. I have a 5510. The 3 interfaces involved are INSIDE, OUTSIDE, and GUEST. Corporate users are allowed to put their iPhones on the Guest network, but the problem is that their Exchange ActiveSync stops working. It is tied to the external DNS name of the OWA server (we'll say webmail.abc.com). So the users are funneled out one public IP on the OUTSIDE interface and are trying to communicate with the outside of the OWA server, which is NATed to another public IP on the same outside interface. What do I need to do on the ASA to allow users on the guest network (behind the GUEST interface) to access the mail server using its public IP (behind the INSIDE interface)
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Jul 23, 2011
I picked up a rather nasty bit of malware which resulted in a format and installation of Windows Ultimate 64, all well now except i cant get the wireless to work, downloaded assorted drivers from the dell support directory but to no avail, so questions are-:am i missing something obvious (windows function button for wireless does nothing)what is the correct driver for the N5040 and are there any tricks in getting it to work.
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Apr 4, 2011
We have a setup where clients on the internal network send/receive their emails through Microsoft Outlook client, while the Exchange server is hosted on the internet, outside the organization.The clients are connected to a Cisco switch, behind an ASA5510 Firewall. The Firewall is connected to an internet router, with double NAT (On the ASA and Router).
the outlook clients disconnect from the Exchange server, sometimes for hours, and then reconnect again. During these disconnections, the same client PCs are able to browse the internet normally. There are no restrictions for the traffic going from the inside to the outside. During the disconnections, if we try to connect using a public IP bypassing the ASA & router,.
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Dec 27, 2011
Is there any way to access a MS Exchange Server 2007 on Windows server 2008 through an ASA 5510 running 8.4 with a full MS Outlook client (not using OWA - web browser)? OWA is currently working fine but I was wondering if access via the full Outlook client is possible and more importantly...is it opening up too many ports on my 5510?
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Apr 23, 2012
I have an ASA 5505 with the base license,When I setup the DMZ interface I had to add the deny access to the inside VLAN. The DMZ works fine with WiFi on it, but user's iPhones can't get email unless they turn WiFi off.Is there a simple way to allow HTTPS traffic through the DMZ interface to our internal Exchange server which is NAT'd on the 5505's external IP?
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Nov 17, 2011
Is there any significance to the parameter "firewall-group" in the command
firewall vlan-group <firewall-group> <vlan-id>…<vlan-id>?
In other words is the series of commands
firewall switch 1 module 3 vlan-group 1,2
firewall vlan-group 1 100,101,102
firewall vlan-group 2 200,201,202
exactly equivalent to
firewall switch 1 module 3 vlan-group 3
firewall vlan-group 3 100,101,102,200,201,202
or
firewall switch 1 module 3 vlan-group 1,2,3
firewall vlan-group 1 100,200
firewall vlan-group 2 101,201
firewall vlan-group 3 102,202
All three of these options associate the same set of vlans to the FWSM but using different groupings. As far as I can tell, these groupings have no functional significance either on the switch side or the FWSM side. These are simply three different ways of specifying exactly the same thing? Am I correct?
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Jan 19, 2013
I want to add new vlan in existing firewall group in 6500. I am confused if it will add new vlan or overwrite.. I am using ASASM module with 6500.
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Jul 31, 2012
I try to map LDAP Group to ASA Group policy following documentation:
[URL]
This is a config for ASA 8.0. I would have expected it to work on 8.4 as well but I do run into problems. The mapping as shown in LDAP Debug and ASA Log will actually happen but it is overwritten by the "GPnoAccess" Group Policy configured locally in the Tunnel Group. From earlier works with RADIUS I would have expected the user specific Attribute to be "stronger"?
ASA Log:
AAA retrieved user specific group policy (correct Policy) for user = XXX
AAA retrieved default group policy (GPnoAccess) for user = XXX
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Apr 25, 2013
I have some problem to get working ACLs. The main purpose of this ACLs is to control what is going out from vlan to internet. (For example, i want that only my proxy can access to the web.) So, i use Cisco Packet Tracer and test new rules in lab without any problem.
interface Vlan1
ip address x.x.x.x x.x.x.x
ip flow ingress
ip flow egress
ip nat inside
[Code]...
But it doesn't work on my Cisco 1811w and i dont uderstand why and i'm not sure to have sufficient knowledge to aolve my problem by my own.
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Oct 4, 2010
My ASA5505 has an external address of x.x.x.13. We have got another 2 spare ip addresses: x.x.x.10 and x.x.x.11.We also have 2 internal hosts, which we need to provide with internet access using NAT. y.y.y.146 and y.y.y.70.
We recently updated our ASA to software version 8.3(1). I was thinking that I could do it using network objects and groups, but didn't understand quite good how this should be done.
The goal is to set up ASA in the way, that if either of the abovementioned 2 hosts will connect to the internet, it needs take one of 2 external addresses. All other hosts should use PAT through x.x.x.13.
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Apr 5, 2011
I can not have "dns server-group" on my asa 5510, could you tell me how to get this command in my ASA 5510.
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Apr 16, 2013
Recently i bought asa 5505 to practice for my exams and i failed to connect to internet since my internet provider binds IP and mac for every users and supports only 6 group mac address (xx-xx-xx-xx-xx-xx) format. because asa 5505 has 3 groups (xxx-xxx-xxx) mac address they are unable to provide me the connection.So my question is how can i assign 6 group mac address to asa5505.
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Mar 17, 2012
i wounder why i'm getting such log message whenever i'm trying to reach my remote site: No translation group found for tcp src outside XXXX dst dmz ZZZZ, i have a Cisco PIX515E firewall and that message is captured there, the traffic is going through a VPN tunnel (the VPN are up on both ends)
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Nov 6, 2012
We are having ASA 5550 running on 8.0(5)23 IOS. We are having 2 failover groups group1 & group2. currently all contexts are on group1 & its active & Group2 is in BulkSync mode but from last 2 days the failover for group 2 is happning, i am not able to find anything in logs. Its happing daily from 2 days.
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May 22, 2012
i have fwsm in cat6500, i have one firewall vlan group which is in firewall module 1 vlan group 10. I need tocreate another vlan group and add to firewall module 1 vlan group 10, 20. i need to have zero downtime.
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Jun 26, 2011
Error message
305005: No translation group found for udp src c_dmz:10.0.176.120/51910 dst inside:195.244.192.16/53
305005: No translation group found for udp src c_dmz:10.0.176.120/51910 dst inside:195.244.192.166/53
[Code]....
I thought it needed a nat (c_dmz) command but I got the following error message
PIX(config)# nat (c_dmz) 0 0.0.0.0 0.0.0.0 0 0 nat 0 0.0.0.0 will be identity translated for outbound WARNING: Binding inside nat statement to outermost interface. WARNING: Keyword "outside" is probably missing.
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Oct 21, 2012
I have an ASA5520 with mobile VPN Ipsec.The "splitTunnelAcl" set the group is not working.
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Mar 3, 2013
I need to use a Cisco ASA 5505 on a BT Openreach connection, The configs that I have ben using are below -
interface vlan2
nameif outside
security-level 0
[Code]....
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Feb 7, 2012
For years now we've had an ASA5510 running an old version of ASA/ASDM (7.0/5.0) and couldn't access ASDM through a modern system with a recent JRE, so we didn't bother with this.
However, we've recently upgraded ASA/ASDM for purposes of adding failover and want to be able to access ASDM through our site to site tunnel. The site to site tunnel gives us access to the VLAN that the firewall is the gateway for, but not access to the firewall itself.
This side of the network is the 10.1.55.0 subnet, and that side of the network is the 192.168.1.0 subnet. I can ping devices on the 192.168.1.0 subnet, but not the firewall, (not that I really need to) and devices can ping me back. I can access ASDM through RDP or ssh into a server on the 192.168.1.0 subnet, but not directly from the 10.1.55.0 subnet.
This is the current config relative to the 10.1.55.0 subnet:
access-list trust_nat0_outbound extended permit ip 192.168.0.0 255.255.0.0 10.1.55.0 255.255.255.0
access-list untrust_cryptomap_600 extended permit ip 192.168.0.0 255.255.0.0
[Code]....
As far as I'm aware, the tunnel comes into the firewall through the untrust (public) interface, because that is the destination of the tunnel on the 10.1.55.0 subnet side.
What am I missing here that would allow asdm access through the untrust interface for the 10.1.55.0 subnet?
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May 31, 2011
I have a 5510 with just a inside and outside interface, everything works on the lan inc internet access and exchange hosting to the net, but I have another exchange server on the wan and I can't get to that because I'm not natting inbound traffic and the default route sends traffic elsewhere.
If I put a nat any statement on the inside interface inbound it works, however all LAN internet traffic fails with a No translation group found error.I've removed the static nat commands as they are all named anyway, but below is what I have before I do a nat any inside inbound command global (outside) 1 interfaceglobal (inside) 2 interfacenat (inside) 0 access-list inside_nat0_outboundnat (inside) 1 0.0.0.0 0.0.0.0.
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Apr 8, 2011
can i have on asa 5510 multiple pools and multiple group authentication for various departments along with restricted access if any
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Oct 29, 2012
We have Cisco ASA 5510, I am about to add another 2 Objectgroup network groups on the firewall to our already growing list. Under this Object-group Network xxxx , we are planning to add about about 500 network-object host xxx.xxx.xxx.xxx . This objectgroup will then be applied to an ACL. Just wanted to know if thats possible - meaning addnig 500 hosts? If it is whats the limit?
Also are there any other things to keep in mind before i go-ahead with this huge object group?
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Jan 10, 2013
I have seen many of these errors lately. We have just moved to a new office and I have basically only assigned a new IP to the outside interface.
[code]....
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