cisco IOS

Cisco 897VA and Orange France compatibility issue

Yesterday I walked into a problem that the Cisco ISR 897VA was rebooted due to a power failure in the building. There was a preload update of the IOS software. The Software which was preloaded were: c800-universalk9-mz.SPA.156-2.T1.bin. After the reboot, the router came up. but there was not a proper connection. After checking that the

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Cisco | Cisco IOS router to Meraki Appliance | site-to-site VPN with Zone based Firewalling

Lately I’m busy to configure Cisco IOS routers in combination with Remote offices where we place Meraki Appliances (like the MX64, MX65 or the Z1) When we do this we create also a VPN connection (site to site). In this setup the Main office has a Cisco IOS router. Configuration of the Main Office. (Cisco

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Cisco | IOS version difference in case of use NO_NAT

Since a couple of years actually I noticed that when I use recent IOS versions on a Cisco ISR device. That there are some struggles with NAT rules in combination with a VPN client. In somecases you have to put the access-list for the NAT rule with a Permit like below. ip access-list extended ACL_OUTSIDE_NO_NAT

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Cisco – Office 365 | Office 365 IP object range on a Cisco IOS Router

In addition of my previous post “Cisco – Office 365 | Office 365 IP object range on a Cisco ASA” You might need it on a Cisco IOS router. It can happen that you need to configure an IP object range for office 365. I most cases this is because you have a policy that

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Cisco Router – Site to site configuration on a router with 2 BGP interfaces and 1 Loopback interface with External IP.

How to create a Site-to-Site VPN Between a cisco ASA to a Cisco IOS router with 2 BGP interfaces and a Loopback Interface. I had some days ago a problem. I had a vpn connection but there was no traffic going over this connection. Below in the diagram how I created this solution and how

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Cisco | Show Running-Config commands

On a Cisco IOS Router you have the comman show running-config this will show you the entire configuration which are currently is configured. How ever beside the show running-config you have some extra commands shown here below: sh run | ?   append    Append redirected output to URL (URLs supporting append operation only)   begin    

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Get rid Cisco IOS router message: %FW-4-TCP_OoO_SEG: Dropping TCP Segment

Some times you will see on a Cisco IOS router the following message in your show logging: 009357: Jul 8 09:28:22.214 CDT: %FW-4-TCP_OoO_SEG: Dropping TCP Segment: seq:104330552 1492 bytes is out-of-order; expected seq:104304632. Reason: TCP reassembly queue overflow – session <internal host>:1535 to <external host>:80 This message can be very annoying if you see it.

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Simple cisco router configuration BGP [ 2 links] and NAT

Few weeks ago I struggled with a configuration that contained BGP and NAT. First I made some really difficult configuration which worked in GNS3 but eventually it didn’t worked on a real router. [ My configuration is based on a cisco router 2951 ] To create a configuration with BGP and NAT you’ve to do

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