WDS Multicast is really slow!

When using WDS to load images, direct SMB unicast works fine but overloads the network and/or server if you have too many sessions. So we try Multicast and that goes incredibly slow! What is going on? There is all sort of info on how to “tune” multicast, but the most likely culprit is your network switches, especially if you have HP procurve switches. There are two things to do. 1) make sure IGMP snooping is turned on for the VLAN you are using. Do this by getting into config mode and issuing the following vlan 1 ip igmp (if you want to enable it on VLAN 1). 2) Change the default mulitcast IP range in WDS from 239.0.0.1 - 239.0.0.254 to 239.0.1.1 - 239.0.1.254 because apparently the default range is ignored by IGMP on ProCurve switches. Nice!

Speeds should be back up to blazing after this.

ds

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