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Hi Graeme,
On Jul 19, 2007, at 11:32 AM, Graeme Fowler wrote:
> On Thu, 2007-07-19 at 11:11 -0700, Jessie wrote:
>> We are seeing a case where our directors are not rewriting the MAC
>> address when the client IP is not within the same subnet as the VIP.
>
> In that case I'd surmise that the realservers have not been sorted
> from
> the point of view of "the ARP problem".
Ah perhaps I am mistaken. I thought the MS Loopback did not send out
ARPs.
In either case, my linux RIPs which are not arping for the VIP (via
sysctl settings)
have the same problem described.
> As you mention using a sniffer on a mirror port from a switch, I don't
> think the director is *seeing* the packets - they're going to the
> realserver(s) directly, at least some of the time.
>
> The fact that you're using Windows realservers, however, means this is
> unlikely. Can you run tcpdump directly on your director when
> connections
> are coming in, and see what that tells you? Better to do it there than
> on an L2 device doing mirroring.
>
Believe it or not, the packet captures I included are from the director.
Another engineer has them on his laptop still :(
We used tcpdump -i eth0 -w file.pcap and then I later filtered out
the cruft.
I also ran Wireshark on the RIP (Windows 2003) and don't see any
traffic.
I attached Wireshark to the LAN adapter (not the MS Loopback) and
filtered on
all traffic containing the directors MAC address:
display filter = eth.addr contains 8a:79
...no matches.
An obvious piece of Info I forgot to mention is the director can
communicate to the RIP in all aspects.
If I send a ping from the director to the RIP I will see that in
Wireshark (rip), and in tcpdump (director).
I also forgot to include the ipvsadm output:
IP Virtual Server version 1.2.1 (size=32768)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 172.16.10.20:80 rr
-> 172.16.10.11:80 Route 1 0 0
I cracked up the debug levels in /proc/sys/net/ipv4/vs/debug_level
and cannot find any identifying traffic for the VIP
-Jessie
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