Controller-less WLANs

What is the default gateway located for VC assigned SSID?

by ‎03-07-2016 11:48 AM - edited ‎03-07-2016 11:48 AM
Q:

1. Can we set the default gateway on VC -assigned SSID?

2. Where is the default gateway on a VC assigned SSID?

 



A:

1. We cannot set the default gateway on the VC assigned SSID. It is the first valid host IP from the scope that is configured.

2. The job of Default gateway is done by the VC. The client will send the packets destined to external networks to the MAC address of the VC.

 

We have a cluster with following configuration:

ip dhcp pool
 subnet 10.0.0.0
 subnet-mask 255.255.192.0
 dns-server xx.xx.xx.xx
 lease-time 60

 

Lets have a look at the PCAP below:

 

  1. VC is 192.168.1.64. slave IP is 192.168.1.66.
  2. In the DHCP offer, the client gets an IP address of 10.0.36.9
  3. Default gateway is first IP address from the range, 10.0.0.1
  4. Packets destined to the internet will be sent without the mac address of the Default gateway of the subnet i.e. 10.0.0.1
  5. We see that the TCP syn is sent to a public site, the frame as mac address of the VC itself. Once the VC receives the packet, it will do a NAT and send the data upstream.

 

 

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