Red Hat Bugzilla – Bug 17753
Minor problem with virtual server network mask
Last modified: 2007-04-18 12:28:38 EDT
In the experimental 0.4.17-3 version of piranha, you added a feature to allow a network mask along with the virtual server IP, instead of assuming a classfull mask, which is a much needed feature. However, it still calculates the broadcast address according to the classful mask, which really doesn't seem to cause a problem, as the LVS router itself, in a direct routing or NAT setup, should never try to reply to a packet from that address. It could possibly cause problems in a tunneling setup, however.
I would have thought ifconfig defaulted to the netmask settings for broadcast. We'll check into it...
That's what I thought too, but when I tested ifconfig yesterday, if you don't specify a broadcast address, it assumes a classful netmask when calculating the broadcast. So it's really a glitch in ifconfig, but you can work around it.
I'm in the process of adding the extra code to calculate the broadcast address for you ie broadcast = ( VIP & netmask) | ~netmask ; I didn't spot ifconfig not calculating the broadcast for itself because I was using a 255.255.255.0 netmask. 0.4.17-4 should be out tonight or tomorrow (depending on how god/bad the offsite company meeting goes. Phil =--=
This issue is now resolved with piranha-0.4.17-4 which you can pick up out of the HA download area (ftp://people.redhat.com/kbarrett/HA/experimental) Phil =--=