Cisco C870

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The Cisco 850 and Cisco 870 series access routers support AAL5. Cisco IOS Software, C870 Software (C870-ADVENTERPRISEK9-M), Version 12.3(nightly. Cisco IOS 12.4(15)T7 (supports ONLY clientless Web Based VPN) CISCO IOS 12.4(20)T (supports all web vpn modes, both clientless and anyconnect Client VPN). Used in Lab for this tutorial: Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3) ANY Connect Client: anyconnect-win-2.3.2016-k9. Cisco IOS Software, C870 Software (C870-ADVENTERPRISEK9-M), Version 12.3(nightly.PCBUWIRELESS041110) NIGHTLY BUILD, synced to hawtpi1pcbu HAWTPI1PCBU200 40924. Does anyone please have the c870-advipservicesk9-mz.151-3.T3.bin file available for upload? Many thanks in advance. CLOSED AS OUTDATED Thanks and regards.

  1. Cisco 870 Password Recovery
  2. Cisco 870 Manual
  3. Cisco C870 Configuration
  4. Cisco C870 Webex

Cisco 870 Password Recovery

This is a quick how-to guide on how to have Microsoft Active Directory user accounts in a security group authenticate to Cisco gear. Afterwards you’ll be able to login with AD credentials on the Cisco router/switch for easier login control and management.

This guide assumes:

  • You have a full AD environment in place
  • You have a basic understanding of Cisco CLI commands
  • You have an AD security group in place for Cisco access

First, install the RADIUS (network policy server) role onto your AD box.

We only need the network policy server role service.

Wait….

After the role finishes installing, we want to right-click on the NPS role and register it in AD.

Cisco c870 cable modemCisco C870

Next, lets add our first switch as a radius client, right-click -> new on ‘radius clients’.

Give it an easily identifiable name (we won’t ever actually need the name), ip address of the cisco device (you can also do entire subnets here), and a secret password

Once that’s done, right-click on ‘network policies’ and select ‘new’

Again, give your policy an easy to figure out name, leave server as ‘unspecified’ and click next.

Under conditions click ‘add’ then select the first option ‘windows groups’ and click ‘add’ again.

Add your already created Windows AD security group and ok out of the prompts.

Leave access permission at defaults and continue.

Set the authentication methods to what is shown below

If you see a warning prompt, click ‘no’ to continue.

Now we get into the tricky bits for Cisco equipment… Remove the ‘framed-protocol’ attribute.

On the left select ‘vendor specific’ and then click ‘add’

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C870

In the vendor dropdown select ‘Cisco’ and then click ‘Cisco-AV-Pair and then ‘add’.

Cisco C870

click ‘add’ and enter the below value exactly as seen: shell:priv-lvl=15

Next until you see the completion screen, verify the settings at the bottom match what is seen here.

Don’t forget to scroll through them all!

Lastly, go back into ‘properties’ on your new policy and check the ‘ignore user account dial-in properties’ box, and click ‘ok’

And that’s it for the Windows side! You now have an AD tied RADIUS server ready to serve Cisco devices. Best practices recommends repeating this process on a second server for redundancy.

On the Cisco device, in config mode, make sure we have a proper aaa model….

Then create the new radius server group, you can add as many ‘server-private’ aka windows radius servers here as you like. Remember the key is the ‘secret’ that we set earlier in the Windows section. source-interface is recommended but not required.

Now we tell the Cisco device to try to authenticate via radius first, then if that fails fall back to local user accounts.

Finally, and optionally, you can set the device to not require the trailing @yourdomain.com at the end of your username when logging in via RADIUS. First set your AD domain name (ex. contoso.com), and then set the IP address of at least one domain controller (you can add more). Next tell radius to directly request our AD domain DCs, which will mean we can login with just AD usernames going forward, not fully qualified names.

And now your all set! Remember to save the config and test logging in as an active directory user on a new ssh session BEFORE closing your current session. If you fail to authenticate for any reason, you can continue to run commands/change the config on the currently open ssh session.

I was setting up a Cisco 877 router on an ADSL 2 BT Broadband connection this week and came across an issue when downloading large files from the Internet. With the router configured, and connected everything appeared to be working OK. The ADSL connection was stable, and the VPN tunnel was up and transferring data happily. I performed a few more checks, one of which was to run a speed test using speedtest.net. The test started fine downloading at around 6.5Mb per sec but when it got halfway through it stalled and didn’t complete. Following this I tried to download a 600MB ISO file using my web browser. It downloaded about 100MB and then stalled. Subsequent attempts produced similar results, although sometimes I could only download a couple of MB, and sometimes 50MB to 100MB, but at some point the download would stop and not get any further.

Cisco

Interestingly, I didn’t seem to get this problem when transferring files over the Site to Site VPN connection, as I transferred around 400MB of data across the VPN without issue. This made me think that it it could be something to do with traffic inspection on the zone based firewall. I did a little digging on the Internet, and found some information relating to out of order packets on Cisco equipment using the Zone Based Firewall. Other reports suggested that if you remove the zone based firewall, downloads proceed normally. It seemed quite a few people have had the same issue that I was having, and there were a few steps that could be taken for verification.

Firstly, in configuration mode set the logging level on the device to ‘debugging’:

router(config)# logging buffered 51200 debugging

Next, turn on logging of dropped packets:

router(config)# ip inspect log drop-pkt

At this stage if you are running in a telnet session you can use the following command to output debug messages to your session:

router(config)# terminal monitor

Alternatively, you can view the log file after testing by running:

router# show logging

After adding the commands to log dopped packets, I kicked off the ISO download again and waited for it to stall. Sure enough after it stopped downloading I got the following message logged (IP addresses have been removed):

Cisco 870 Manual

%FW-6-DROP_PKT: Dropping tcp session X.X.X.X:80 X.X.X.X:52334 due to Out-Of-Order Segment with ip ident 0

Apparently the zone based firewall has a bit of an issue with out of order packets, but fortunately support for out of order packets has been introduced in IOS versions 15 and above. This 877 router was running IOS version c870-advsecurityk9-mz.124-24.T7.bin. There was only the standard 24MB flash in this router so I upgraded to IOS version c870-advsecurityk9-mz.151-1.T4.bin.

Cisco C870 Configuration

After applying this upgrade the issue was fixed, and downloads proceeded normally.

Cisco C870 Webex

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