All_about_network

This post is brief introduction to configuration of DHCP relay with option 82 on S3900,S5600 and S6500.

Scenario I
Let’s use S3900 as an aggregation switch and relay directly from there. As the S5600 is almost the same I expect that configuration of these two devices are the same (and the configuration as well). Actually the config options are much better than on S6500.
Vlans 10 and 100 are used for the realization Continue reading

I was actually playing with DHCP relay and what I did find out is kind of interesting. For what is DHCP relay look for rfc3046 .
In short it is when the client sends a DHCP a broadcast message (discover) some device (usually the switch that is the client directly connected to) intercepts the packet and sends a unicast discover instead of Continue reading

Ok so from the previous post is clear how to make one tunnel using IPSec, IKE and isakmp.

So what if the situation is that you need multiple tunnels on one ip interface.

There is a limitation of one IPSec policy being applied on particular interface at one time so it is impossible to use more various policies. But there is a workaround - Continue reading

So I am playing with IPsec Tunnels on Huawei’s AR28-31 it is really interesting in may ways.

I have two basic scenarios:

1. tunnel between two peers that are stable (two routers)
2. tunnel utilizing the “client-server” where only router has a stable public IP and clients are some PC’s

Of course I do realize that in IPSec there are no  clients and server but just a peers on the same level, but I Continue reading