Re: [lvs-users] arp problem with 2.6.X red hat kernels?

To: " users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] arp problem with 2.6.X red hat kernels?
From: Dan Yocum <yocum@xxxxxxxx>
Date: Thu, 20 Sep 2007 15:18:58 -0500

lists wrote:
> Joseph Mack NA3T wrote:
>>> # horm's tranparent proxy for LVS
>> doesn't work anymore.
> iptables REDIRECT (horm's method) still works on the real servers (not 
> sure it ever did on the LVS host.)
> It has more latency than the modern 2.6 sysctl way though.

Oh, interesting.  arp_announce and arp_ignore.  Thanks for the hint. 
Ah, but those are only for physical interfaces and will even affect 
so-called virtual interfaces (i.e., eth0:0).

How much more latency are you talking about?  Using horm's method I was 
able to transfer 9.8Gbps through a whole bunch of gridftp servers back 
in '05 and the traffic on the director only increased 100-200kbps. 
Granted, latency != throughput, all the time.

Ah, yes, now I'm starting to remember why horm's wrote the transparent 
proxy stuff: arptables still wasn't available in RH kernels.  Now that 
it is, I may look at.  But, I'm rather happy to keep my transparent 
proxy stuff in iptables from days of yore, if it works.


Dan Yocum
Fermilab  630.840.6509
Fermilab.  Just zeros and ones.

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