9

I got response from Cisco Tech support and there are a few things not correctly described in the manual. First, ASR router supports key size 1024 bit or smaller contrary to its manual(supporting up to 2048 bit key). Second, only the key part of SSH public key must be 'de'coded w/ base64 en/decoding program. SSH Key Generation ssh-keygen -b 1024 -t rsa -f ...


9

UPDATE 01/10/2018: Added missing library to enable Perl regular expression support (libpcre3-dev) UPDATE 11/07/2017: There is a bug in MAVIS. If you are having trouble using LDAPS on port 636 or 3269, completely remove the USE_TLS configuration variable from your tac_plus.cfg. This will fix the problem. I've emailed the author with my findings. This guide ...


8

It seems that this line is missing from the c2600... aaa authorization exec default group radius local Exec authorization is what gives a login session the ability to pay attention to priv information from the RADIUS server.


7

I am aware of MAC address filtering available on most WiFi routers, but this is about access control on a device by device basis. One user may have many devices. Is there any way to control WiFi network access on a user by user basis? Use 802.1X with PEAP/MSCHAPv2. This authentication scheme will permit you to authenticate your users against a RADIUS ...


6

Would using Radius be an option? You can differentiate AD groups using radius attribute 25 (class). Full walk through from Jeff Boyer on the Cisco forums may be found at: https://supportforums.cisco.com/docs/DOC-15074


6

Your SSH client is saying "we can't agree on the cipher: server wants X but I'm configured not to speak X". This is a completely general SSH problem, not specifically related to this model of switch, which is that the SSH clients are regularly changed, usually to disallow older, weaker, ciphers. This isn't about key length, it's about cipher algorithms. ...


5

According to my experience the two most common issues when dealing with AAA and Radius are: Misspelled/Absent pre-shared key on the RADIUS server or on the NAC (Radius client) The Radius server misses the configuration to allow requests from a client. Doing troubleshooting with comments it turned out that the pre-shared key was missing on the router. To ...


5

802.1x is port based. So, in simplest form, the port is either authorized or not; once authorized -- MAC limits aside -- traffic from anything will be allowed. Modern 802.1x systems are much smarter ("more complicated") and can independently police multiple hosts on a single port. This is where multi-auth and multi-domain come in. (consult Cisco here) As ...


5

Well I managed to figure this out. The bottom line is: Using authentication-key-chains uses the "TCP Enhanced Authentication Option" Using authentication-key uses the "TCP MD5 Signature Option" From https://tools.ietf.org/html/draft-bonica-tcp-auth-06 12.4. Backwards Compatibility On any particular TCP connection, use of the TCP Enhanced ...


5

Here's a generic example of a Cisco device. The localadmin user can only use the console port, unless tacacs is not available, in which case the user can login remotely. username localadmin password xyz priv 15 aaa authentication login CONSOLE local aaa authentication login VTY group tacacs+ local aaa authorization exec VTY if-authenticated aaa ...


5

The 2910al supports 802.1X port security as authenticator, using RADIUS over EAP or PEAP. Depending on your exact goals, an additional router is not required but you do need a RADIUS server. Check the 2910's "Access and Security Guide" chapter 13. If you've got nothing local to use as a RADIUS server you'll need a router to connect elsewhere - however, you ...


4

I can sympathize, IOS authentication mechanisms are not simple to understand. The closest command that does what you want is show aaa method-lists authentication. However, this command is not really bullet-proof for the purposes of auditing system login authentication methods. Example usage: For example, let's suppose we have a switch with the following ...


4

802.1X does perform either a computer or a user authentication to allow the network access. NAC is a generic term designing any form of Network Access Control. Then 802.1X is one kind of NAC. I consider 802.1X to be the standard of NAC. Beware here of the abbreviation collision around NAC which stands for Network Access Control and Network Admission ...


4

You would need to configure MAB (Mac Auth Bypass) authentication for the ip phone in the multi-vlan interface. You also need multi-auth so the switch knows to look for more than one MAC address. -authentication host-mode multi-auth -authentication order mab dot1x


4

You can try to disable dot1x port-control on a specific interface under interface configuration mode using no form command of no dot1x port-control ...


4

There are many variables to consider when configuring LAN Authentication, but here is a page from the HP manual on configuring 802.1x, and here is one from the Freeradius Wiki. These two links should get you started.


4

This line: aaa authorization exec default local Doesn't allow you to start a shell (Exec) with Radius credentials. You should change it to: aaa authorization exec default group radius local


3

First of all I don't think that static MAC-IP bindings have anything to do with security. MAC addresses can be easily faked and guessing a valid but unused IP for your network and manually assigning that to an interface is not rocket science. What you are looking for is most probably 802.1x. With 802.1x each client gets a certificate and only those clients ...


3

Putting aside the question of how one would define a "safe network," web authentication is typically used to restrict access by wireless users to a resource, such as a corporate network, or Internet access. Without using some form of encryption, anyone within range can sniff traffic and eavesdrop on the data being sent. In other words, using web ...


3

I upgraded to Anyconnect 3.1.04063 and this has resolved my problem.


3

There's a standard to achieve this: 802.1X. Basically the switch request authentication from the computer, then contact an authentication server to validate the credentials and depending on the answer the switch will deny or allow access. There's further possible options, like placing the host in a guest vlan if not authenticated or placing the host in a ...


3

Before 2 hosts start using AH with each other, they need to agree on a common set of parameters, a security association or SA. This is typically achieved using the IKE protocol (IKEv1 or IKEv2). As part of this negotiation they also derive a session key or "secret", i.e. a random value that only these 2 hosts know. This secret is then also fed into the ...


3

You are misunderstanding what that is telling you. Simply for the purposes of the calculation, you use zero for those fields; you don't actually change those fields to zero for the packet.


3

In short, you can't. One option is to create a separate WLAN (with a separate SSID) that has a static password. You should also apply strong filtering on that WLAN, so that the devices can reach only the necessary destinations. As @ronmaupin points out, IoT devices tend to have all sorts of vulnerabilities. So putting them on a general production WLAN ...


2

I don't know of any switches that are 802.1x supplicants, so Option A is probably out. So between Options B and C, the primary difference is cost. I imagine rewiring your office is both expensive and disruptive, vs the cost and the hassle of managing all those new switches. The real question you should be asking is, what threat am I defending against, ...


2

The most common way is to segregate access based on group membership. Within ACS there is/should be an "Access Policies" menu - I won't go into every detail of configuring ACS here, because that's why there's a manual, but you can essentially define your policies of which groups members can log in (and which group members have access to run which commands) ...


2

You have to allow DNS through. Without DNS resolution, the http(s) requests will not finish and trigger the redirect to the login page. What I did was add a rule that permitted DNS for All as the first rule, then everything else permitted for Trusted Users.


2

HTTP and HTTPS are different protocols. Redirecting port 80 to port 443 would mean that clients are trying to talk HTTP on port 443, which fails because the server is expecting them to talk HTTPS. You need to do a redirect in HTTP using a 301 or 302 redirect code.


2

Note: By default, the router uses its hostname to identify itself to the peer. However, this CHAP username can be changed through the ppp chap hostname command. Refer to PPP Authentication Using the ppp chap hostname and ppp authentication chap callin Commands for more information The information above was taken from http://www.cisco.com/c/en/us/support/...


2

Following the steps from here you should be able to reset the password. 1. Connect to the router using a RS-232 cable 2. Connect to the router via HyperTerminal 3. Settings for HyperTerminal = 9600 - 8 - None - 1 Flow Control = None 4. Power cycle the router and right away press the s key continuously until you see the login prompt > (Starts up with ...


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