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Ndheureuse

1 Rookie

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7 Posts

4781

September 28th, 2004 09:00

Features of 6024

Hi! We are thinking about buying a 6024. But before we by it, I want to check if I got it's features correctly:

  • Is it correct that there is no possibility to forward IPX-traffic between different subnets/VLANs ?
  • Concerning the UDP-Relay-feature: I need to route some UDP-broadcast traffic to different subnets (from all subnets to all other subnets for specific UDP-ports). If I got the manual correctly, this is possible with the UDP-relay by setting the source- and destination-ip to 255.255.255.255. The CLI-reference states, that "the maximum number of address-port-pairs is 128". This means, that in my case I could route a maximum of 128 different ports from all subnets to all others. Is that correct? Is there a possibility to add a port-range instead of only single ports?
  • When the "Directed broadcast"-feature is enabled, will IP-broadcast be forwarded only to the same subnet/vlan or to all subnets?
  • What happens with ARP-requests? Are they forwarded to different subnets when "Directed broadcast" is enabled?

Thanks in advance!

GregG1

2 Intern

 • 

812 Posts

September 28th, 2004 11:00

  • The 6024s routing capabilities are limited to IP traffic. It will forward IPX traffic at the Data-Link layer (layer 2), but is not capable of routing IPX traffic at the Network layer (layer 3).
  • When using helper addresses, only a list of ports can be used. There is no way to specify a range. More information about helper address commands can be found here: http://support.dell.com/support/edocs/network/pc6024/en/clig/ipaddres.htm#1035866
  • A directed broadcast occurs when a device sends traffic to the broadcast address of a subnet to which the sending machine is not directly attached. This broadcast is routed as a unicast until it reaches the target subnet. If directed broadcasts are enabled on the end router, it will convert this directed broadcast into a link-layer broadcast for the target subnet. If directed broadcasts are disabled, the router will drop this traffic.

** Note: Directed Broadcasts are commonly used for smurf and fraggle DoS (Denial of Service) attacks. It is recommended to disable this feature if it is not absolutely necessary. **

  • A router will not forward ARP broadcasts. They will be isolated to their own subnet.

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