Cisco Firewall :: 5510 - Cannot Ssh After Mask Change
Aug 7, 2011
I needed to change the mask, not the ip address, of the outside interface of an 5510 running 8.2(3).
Immediately afterwards I could establish ASDM but could not re-establish SSH.
I tried the following:
Zeroize the rsa key and generate a new one Create a new SecureCRT session to accept the new key
That didn't work. All I have is ASDM access.
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Jan 28, 2011
our subnet mask is 255.255.255.0....can I change it to something else like 255.255.0.0.
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Jun 3, 2007
I am using a BEFSR41 for my network. My internal netmask is 255.255.0.0. The only options permitted in the dropdown list on the BEFSR41 is 255.255.255.0. How to change the netmask?
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Dec 19, 2012
I have a Cisco 5510 which has remote access VPN configured.Now I have new block of IP address, is there a way I can just change the outside interface IP so that people can remote in without doing anythng else?Or if I coulds be taught to create a new one.Or best way to approcah this issue?For example: it was 67.64.x.x now I need to change to 64.44.x.x.
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Nov 4, 2012
We will be moving to a new data center in the very near future and with them our WAN IP addresses will be changing. Any best course of action for changing the IP addresses throughout the firewall configuration? Would it be possible/suggested to export the running-config, make the neccessary changes, then import the config? I am familiar with the ASA 5510 only so far as changes are required. It is not something I work with on a regular basis.
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Dec 27, 2010
We've recently shut down an interface on one of our ASA 5510s as we no longer use that service provider. The dashboard, however, still insists on showing traffic usage on this interface. How do I change the dashboard to display a more meaningful interface?
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Aug 8, 2012
We have an ASA 5520, working fine.One of the interfaces is connected to users PCs and printers mainly. Last months the number of devices has grown rapidly, and we would like to make some changes in it in order for it to be able to host new devices.We thought on change subnet mask of actual subnet (10.0.2.0/24) to 10.0.2.0/23, so it can hold as many devices.I understand I have to make some changes in the ASA, but my question is:What will happend to the acces rules I have created?Will I need to create them again? There are some objects which carry information about subnet mask, so I suppose I will need to redefine them, but for those without any subnet mask information, will I have to redefine them?
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Feb 11, 2013
I have an ASA5505 which provides internet (just internet) for about more than 600 pc/laptops. Can 5505's DHCP support this number?
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Feb 27, 2013
I need to create a vpn connection between two ASA firewalls and when trying to create this AI get an error message below, The config I was to use is -
object net-local
Subnet 10.51.212.1 255.255.255.0
object network net-remote
subnet 10.10.2.65 255.255.255.0
ERROR: network IP address/mask <10.10.2.65/255.255.255.0> doesn't pair
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Jun 11, 2013
We are planning to split the Private servers from the DMZ Servers and configure an additional Interface and segment for this purpose.
Private Servers Segment: 192.168.4.0/24 (there is no DHCP all servers' IPs are statically configured)
DMZ Segment: 192.168.3.0/24 (This is a future deployment)
LAN Segment: 172.17.0.0/16
Both, Private Servers and DMZ Servers are in a collocation as well as the ASA5520. There are multiple Branch offices that uses subnets within the 172.17.0.0/16 Network and they are connected to the ASA5520 via Metro-E.
I do not know if this is possible but what I want to do is this:
In order to avoid the change of internal DNS records I want to mask the DMZ servers with a Private Server IP when a Private server or LAN host wants to access it like this:
The FTP server in the DMZ has the IP address: 192.168.3.100. But when a PC from the LAN wants to reach the FTP server it should points to its old IP: 192.168.4.100. This way the PC sends a packet to the ftp.corporate.net (192.168.4.100) the ASA recieves the packet and translate it to the (192.168.3.100) and send it out through the DMZ Interface.
Also if the Private Servers wants to reach the same FTP the ASA will act like a proxy-ARP and send the paquet to the DMZ by means of the translation of the IP.
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Mar 7, 2011
editing the name of a vpn connection profile and its policy, i have created the profile throught ipsec VPN wizard, the profile got automatically the name: DefaultRAGroup and also its grouppolicy got the name: DefaultRAGroup, in the edit window i cant change the Name?how can i rename them?
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Feb 16, 2011
I have successfully setup radius using win2003 IAS and cisco asa 5510 running asa version 8.2. My vpn client is 5.0.07
For the user account on my win2003 IAS, i enable the option "user must change password" but when i try connecting i was not prompted to change password but the window kept popping up again for me to key in username and password. If i disable the option "user must change password" i can login successfully. I would like to have the option to change password.
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Mar 3, 2013
i have following problem. I configured on a Cisco ASA5510 VPN authentication with LDAP. It works fine but one thing doesnt works.If i configure on my Active Directory the user for "User must change Password at next login" the message for password change is coming (look screenshot AnyConnect1), but if the user want to change his password, the password will not accepted by the system(look screenshot AnyConnect2).In the Group Policies on my Active Directory i disabled all features(look screenshot Pic1)I tried all combination for the password, but nothing will accepted.i configured LDAP over SSL and in the Tunnel Group i enabled the password management with "NOtify User 2 days prior to password expiration".
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Feb 21, 2012
We have an application which is accessed over WAN (V-Sat) and the end users are facing the session timeout problem frequently .
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Jun 23, 2012
Router: ASA 5510
We have changed the ISP, so therefore new wan ip-addresses.
Internet works, and site-to-site vpn works, but I'm failing to localice why the remote access vpn won't work.
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Nov 14, 2011
i configurated ipsec vpn at cisco asa 5510. all them are working very well. now i want to change ipsec remote vpn to L2tp over ipsec.i have router, asa and 3750 switch. all nat translation are done at router , ipsec vpn configurate at asa.
this is my ipsec configuration. this is working config. as you see i do static nat asa outside ip for vpn at router. now i want l2tp over ipsec. before i do it i have some question
1. must i do static nat port udp 1701 for l2tp over ipsec vpn? can i write access list at asa to open port 1701?
2. can i remove this static nat or i can not be change anything.is this nat is true for l2tp over ipsec vpn?
3.as you see user authentication from radius server at ipsec vpn. i also want this is same as l2tp over ipsec vpn..
4. i think that i must be add this addtional config. is this true? tunnel-group DefaultRAGroup ppp-attributesno authentication chapauthentication ms-chap-v2
is this config enougth for l2tp over ipsec vpn?? what is addtional config i need?
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Mar 29, 2012
I have an ipsec tunnel IP is changing from mythical 200.200.200.182 to 200.200.200.254. Is it possible to change the .182 ip in below config via the CLI to .254 and have the site-to-site vpn continue to work? [code]
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Jul 13, 2012
I want to calculate Subnet Mask for 3 Router Each one in separate building the First building need 60 host and the second building 25 host and the last one 25 host .
Knowing that the company currently reserved public class C network address 210.2.1.0/24 for internal address and subnet 210.15.10.0/30 for the connection to the Internet router.
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Nov 12, 2012
I would like to set the subnet mask off the lan to 255.255.240.0 but the selection menu do not allow to do it.
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Mar 15, 2012
How are asa5540 in high availability mode upgraded for their versions.
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Jun 12, 2012
I have old interface hardware with Static IP 10.2.2.200 and on the same switch I have computers with IPs of 10.4.1.0 If I change subnet to 255.0.0.0 old hardware with 10.2.2.200 will be accessible. The problem is that I would like to have 255.255.255.0 as subnet but it should still be possible to access 10.2.2.200. Can I add Static route for oldhardware in XP without adding gateway settings? The most simple would be to put all on same subnet but it is not possible due to a various reasons. The computers are running Windows XP
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May 8, 2011
what is subnet mask of 10.2.1.3/22
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Apr 27, 2011
why do class D doesn't have subnetmask
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Jun 26, 2012
I want to use a subnet mask of 255.255.254.0. The setup window doesn't allow me to type in that mask, rather it only allows me to choose from options on a drop down menu (which doesn't include that mask). Is there a way to do this?
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Mar 6, 2011
I understand ip addressing and what a subnet is.But why is it sometimes I connect two things together,it always requires a subnet mask, and other times no? For example when I try to connect two computers together, it requires both IP and subnet mask.But if I use FTP software all it ask for is IP.Same thing when connecting to a website through their ip, doesn't require subnet.
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Feb 27, 2013
I am using TP-Link wireless router model no. TL-WR941ND.my isp provided static ip via cable modem.ip = a.b.c.d subnet = 255.255.255.254 = /31 but the router does not support subnet mask saying wrong subnet mask?
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Feb 23, 2011
subnet mask address is illegal cisco linksys?
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Nov 27, 2012
after recovering from the PPPoE-port-forwarding-fiasco I had with the RV180 (url...), I decided to try again with a Small Business Router from Cisco. This time I took the RV042G, hoping that the higher age of this product comes with a more mature firmware.So far the functions I need, work satisfying. There is only one issue: The subnet-mask is only configurable using a dropdown-menu. I've read the posts from the Cisco-Support staff saying, that this is because it is only a SMB Router. So, we are a small business and we use the 172.20.x.y net for several reasons. One of it is to distinguish and group several network devices using the third block of the IP. Eg. our printers IPs start with 172.20.5.x and so on.
My question is: Is it really impossible to change the subnet-mask dropdown-menu to a simple text-field in the frontend? Because it is possible to change the subnet to whatever one needs by a little cURL-magic: [code] This sets the new subnet-mask permanently (even survives a reboot and is displayed correctly on the system-status page) and I have not discovered any problems.The only thing is, if you change settings on the setup -> network page, the netmask is reset and you have to rerun this script.
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Nov 3, 2012
Given an IP address range, select the correct subnet mask for the scenario. IP address: 132.250.0.0/16, You need to create 100 networks with a minimum of 500 hosts per network. What is the correct Subnet mask and the 10th subnet address range?
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Apr 18, 2013
what my IP address, my subnet mask, and what my default gateway is. I have tried typing "ipconfig" into CMD but then I only got up 100 boxes saying "Permissionisconnected"
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Aug 22, 2011
I'm using my WRT320N as a home router, I need more ipadresses to be delivered to my computers, yet I can't get my router to give med wider netmask range. In the list I get 255.255.255.0 - 255.255.255.240 or something like that. I need 255.0.0.0 on my network and that would be perfect if i could get that...
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Dec 13, 2011
We have 10 ADSL lines and 5 of them goes in the load balancer (One gateway) and the rests are used as default gateways for internet access. We use ADSL routers as access points for internet, but those routers should be part of our network and should be given an address in order for them to act as default gateways for internet access. I'm facing a real prob with the ADSL routers Linksys WAG54G2 because they doesn't support a subnet mask 255.255.0.0 Any recommendation for an ADSL router model that support a netmask 255.255.0.0 ?
My cisco 2811 router interface configuration ip address: 172.20.0.1 255.255.254.0.Load balancer output lan ip address: 172.20.0.5.My ADSL routers will be in the following range : 172.20.0.6 - 172.20.0.10
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Sep 28, 2011
Have a problem with a laptop connecting to a Wireless Router. The laptop was working fine on the last router which was on an ADSL Network.. (not that that matters),When the new router (Virgin Media / Cable) was installed all other laptops where connecting to it without any probs, but not this one.The laptop in question still receives an IP address, Subnet mask and Gateway from the router - Vista says Local only, no internet access. It cannot ping anything else on the network either. When I do ping it comes back destination host unreachable.
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