Inter-networking ( Routers )

Cisco Router information / configurations / hints.

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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Cisco IOS router DMVPN connection with OSPF routing

Today me and my colleague where troubleshooting why EIGRP didn’t work on a Cisco DMVPN connection between 2 sites. We saw that the cisco router could make an connection with the vpn crypto configuration. We thought the connection is okay but unfortunallity the routing didn’t work so good.  We couldn’t get any data from site …

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How to activate demo license on a cisco router 880 series

If you have a cisco router 880 serie with an advsecurity license but you find out your unable to use some protocols which you like to use. I found out that the cisco router 881w had an demo license of the advipsecurty license. router#sh license feature Feature name     Enforcement  Evaluation  Clear Allowed  Enabled advipservices         yes         …

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Cisco IOS router + Cisco Catalyst automatic configuration Backup

Today I was figuring out how to get an automatic backup of the configuration of a cisco router device. After some searching I found a Cisco Document. ( click here ) In this document was written how to create an automatic backup. What do you need to create this backup. A computer or server with …

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