> I am trying to set up DHCP for linux users on our VSWITCH. > > Right now I have two linux users, both on VSWITCH. One is the DHCP > server (SLES9 SP2 with ISC dhcpd), and one is the DHCP client (SLES10 > with dhcpcd). > > The client sends its VM user name as its DHCP client identifier; the > server assigns a fixed address using that instead of the ethernet MAC > address, as our VSWITCH is running in layer 3. > > It's partly working right now. The client sends its DHCPDISCOVER. This > is received by the server, which sends its DHCPOFFER. The DHCPOFFER is > never received by the client. > > Here is a tcpdump on the client. You can see it sending DHCPDISCOVER: > > 27 769.364929 0b.00.0a -> 00.7f.f9 FC Unknown frame > 28 833.397832 0.0.0.0 -> 255.255.255.255 DHCP DHCP Discover - > Transaction I > D 0x7ff9580b > 29 833.409721 0b.00.0a -> 00.7f.f9 FC Unknown frame > 30 897.567832 0.0.0.0 -> 255.255.255.255 DHCP DHCP Discover - > Transaction I > D 0x7ff9580b > 31 897.572165 0b.00.0a -> 00.7f.f9 FC Unknown frame > > Here is what's going on at the same time, from the server's point of > view, receiving DHCPDISCOVER and sending the DHCPOFFER: > > 0.000000 0.0.0.0 -> 255.255.255.255 DHCP DHCP Discover - > Transaction ID 0 > x7ff9580b > 0.000164 0.0.0.0 -> 255.255.255.255 DHCP DHCP Discover - > Transaction ID 0 > x7ff9580b > 0.005826 192.54.6.17 -> 255.255.255.255 DHCP DHCP Offer - > Transaction ID 0 > x7ff9580b > 0.008912 192.54.6.17 -> 255.255.255.255 DHCP DHCP Offer - > Transaction ID 0 > x7ff9580b > 0.009443 192.54.6.17 -> 255.255.255.255 DHCP DHCP Offer - > Transaction ID 0 > x7ff9580b > 0.011666 192.54.6.17 -> 255.255.255.255 DHCP DHCP Offer - > Transaction ID 0 > x7ff9580b > > This is as far as we get. What is preventing the DHCPOFFER from being > received by the client? I don't understand how this could be only > half-broken (the IP broadcast works in one direction, but not the > other). Is there some patch or APAR we're missing? I really, really > hope we don't have to reconfigure our VSWITCH to layer 2 to make this > work. > > Thanks; > > ok > r.
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