[lvs-users] Apparent MTU problem using LVS-DR and Windows 2003 RealServers
Joseph Mack NA3T
jmack at wm7d.net
Wed Sep 16 02:27:40 BST 2009
On Tue, 15 Sep 2009, Christopher Smith wrote:
> I have a somewhat weird (at least to me) problem with an
> LVS-DR setup that has some Windows 2003 RealServers.
> Firstly, this whole setup is VMs running inside an ESXi
> 4.0 host, in case that sets of anyone's alarm bells up
Well, there is a standard networking problem with at least
one VM but I would have hoped it would be fixed by now. Have
a look in the HOWTO before bothering with what may be
> Then it just continues with the 'need to frag' messages indefinitely.
does the otherwise normal TCP service encapsulate packets?
> I had a bit of a look around on Google and the list
> archives, but all the postings I could find were referring
> to using LVS-TUN, not LVS-DR.
> Has anyone seen this problem before ? I'm assuming it has
> something to do with the larger data transfers of the
> DICOM association needing packets to fragment, but the
> smaller HTTP requests do not, but surely that shouldn't be
> a problem with all hosts on the same vlan ?
The LVS-Tun MTU problem is solved, at least for LVS (but not
for Linux networking in general). You could just try it
blind - ie without any understanding of the problem -
reducing the MTU using the same methods as for LVS-Tun.
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!
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