Bob, why is the MTU size 1800? > _____________________________________________ > From: Nix, Robert P. > Sent: Tuesday, December 20, 2005 8:05 AM > To: Barber, Erik A.; Piotrowicz, Ronald J.; 'Linux on 390 Port' > Subject: Networking question after Saturday's upgrade attempt... With > pictures > > << File: network1.jpg >> > > Attached is a picture of the three "states" of the zVM / zLinux network. The > bottom is a picture of the routing that is happening now and in the past. The > center is what we tried to get to on Saturday and couldn't get to work, and > the top is the way it will ultimately be routed. > > What happened Saturday was that we could talk between several zLinux images, > could talk from zLinux to zVM, and could talk to zVM from outside the router. > But we couldn't talk from the zLinux images to the outside or from the > outside to the zLinux images. > > Below is the device and routing portion of zVM's TCPIP definitions: > > DEVICE [EMAIL PROTECTED] OSD 8100 PRIROUTER > LINK MFLINUX1 QDIOETHERNET [EMAIL PROTECTED] MTU 1800 > > DEVICE HIPR1 HIPERS 1D00 PORTNAME GRIZZLY AUTORESTART > LINK HIP1 QDIOIP HIPR1 > > DEVICE TUX18 CTC F180 > LINK TU18 CTC 0 TUX18 > > DEVICE TUX24 IUCV 0 0 TUX24 A > LINK TU24 IUCV 0 TUX24 > > ; (End DEVICE and LINK statements) > ; ---------------------------------------------------------------------- > ; ---------------------------------------------------------------------- > HOME > 129.176.250.8 MFLINUX1 > 192.168.37.100 HIP1 > ; (End HOME Address information) > ; ---------------------------------------------------------------------- > GATEWAY > ; Network First Link MTU Subnet Subnet > ; Address Hop Name Size Mask Value > ; ------------- --------------- ---------------- ----- --------------- > --------------- > 192.168.37.18 = TU18 1500 HOST > 192.168.37.24 = TU24 1500 HOST > 192.168.0.0 = HIP1 1500 0.0.255.0 > 0.0.37.0 > 129.176.0.0 = MFLINUX1 1800 0.0.254.0 > 0.0.248.0 > DEFAULTNET 129.176.248.1 MFLINUX1 1800 0 > ; (End GATEWAY Static Routing information) > ; ---------------------------------------------------------------------- > START [EMAIL PROTECTED] > START HIPER1 > START TUX18 > START TUX24 > ; (End START statements) > ; ---------------------------------------------------------------------- > > IBM's idea of netmasks is a bit squirreled, but my interpretation is that > anything in the 192.168.37 network (except 18 and 24) should be able to talk > to anyone else in the network directly, and that anything in the > 129.176.248-250 network should be able to talk to anyone else directly. > Anything that VM sees that it can't directly route should go to > 129.176.248.1. The default route for the Linux guests go to 192.168.37.100, > so it should flow through here to VM's default route to get to the outside > world. > > I've specified "Primary router" on the definition for the VSwitch connection > ([EMAIL PROTECTED]) This definition, through the "magic" of VM and virtual > devices, points eventually to real device 8200. Everything was put together > when I thought I was going to end up on 8100, and it was easier to "fake" it > with the virtual address than to go back and change all the places it was > specified. > > The actual VSwitch definition in the system config is as follows: > > GRIZZLY: Define VSWITCH VSWG rdev 8200 IP prirouter portname OSAHAL2 > > I'm not sure how much more I know about the problem> ...> Is there a static > route somewhere that would keep the 192.168.37 IP addresses from routing > through the new VM 129.176.250.8 IP address? Do I have my routing horked in > some way? In either case, what do I need to do to fix the problem? > > Help from any quarter will be deeply appreciated... > > -- > Robert P. Nix> Mayo Foundation > RO-OC-1-13 (new loc) 200 First Street SW > 507-284-0844 Rochester, MN 55905 > ----- > "In theory, theory and practice are the same, but > in practice, theory and practice are different." >
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