EIGRP Filtering (GNS3 lab)

In this GNS3 lab we’re looking as the various options on how we can filter updates between EIGRP speakers and then how that affects the traffic flow (as EIGRP is a distance vector protocol we can filter updates :))This is…

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GET VPN (GNS3 Lab)

Group Encrypted Transport (GET) VPN is slightly different and has quite different use cases from more traditional point to point IPSEC VPN where each point to point VPN is quite distinct in its own right. The most import thing to…

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EIGRP (Named vs Legacy)

Just a quick look over the basic differences with the newer style of EIGRP config. It really is quite a bit nicer (more logcal?) layout in the config with things like authentication moving under the eigrp config so its easy…

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Generate DSCP marked pings

Today it was useful to confirm a switch was passing DSCP marked packets as expected and handling ‘ef’ marked packets. To do this on a cisco switch we can use the extended ping feature and set the Type of Service…

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SNMP ACL (after community check?!)

Not my usual kind of post of “how to do …blah” but something I’d come across yesterday that was a little interesting/annoying/silly. Best practice dictates you apply an ACL to your SNMP config so only configured hosts can poll a router/switch even…

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Grab multiple OIDs via SNMPwalk

SNMPWALK is a great too for grabbing SNMP oject identifier values (OIDs). To see how to install it see this post here. Mostly I use it for checking various single OID values but sometimes is can be useful to grab more…

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