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Dear All,
I figure out my arp problem.
At the real server, I had two NICs.
During the test,
I ifconfig the eth1 = 192.168.1.110 down.
So, eth1 device does not appear. ( Actually, I ignored eth1.)
So, when I set lo:0 = 172.26.1.110, there was no arp problem.
Actually, even I set lo:0= xxx,xxx,xxx,xxx except 192.168.1.110
there was no arp problem.
But, When I set lo:0 = 192.168.1.110, arp problems occured.
After removing eth1 NIC, arp problems do not occur.
Thanks for your guide.
I am sorry for my mistake.
with my best regrards,
Young C. Cho
> -----Original Message-----
> From: mack@xxxxxxxxxxxx [mailto:mack@xxxxxxxxxxxx]On Behalf Of Joseph Mack
> Sent: Monday, October 02, 2000 10:55 PM
> To: Young C. Cho
> Cc: LVS users; Julian Anastasov; Joseph Mack; horms@xxxxxxxxxxxx;
> mack@xxxxxxxxxxx
> Subject: Re: arp problem : 172.26.20.xxx vs 192.168.1.xxx
>
>
> "Young C. Cho" wrote:
> >
> > Dear All,
> >
> > I am testing DR on kernel 2.2.14.
> >
> > My setting is
> >
> > (Client) -----------------------------(Director )
> ---------------------------( Real server 1 )
> > any DIP: 172.26.20.111 (eth0)
> RIP : 172.26.20.112 (eth0)
> > VIP: 172.26.20.110 (eth0:1)
> VIP : 172.26.20.110 (lo:0)
> >
> > At the real server 1, I configured the server according to
> > http://www.linuxvirtualserver.org/arp.html.
> >
> > echo 1 > /proc/sys/net/ipv4/ip_forward
> > ifconfig lo:0 172.26.20.110 netmask 255.255.255.255 broadcast
> 172.26.20.110 up
> > route add -host 172.26.20.110 dev lo:0
> > echo 1 > /proc/sys/net/ipv4/conf/all/hidden
> > echo 1 > /proc/sys/net/ipv4/conf/lo/hidden
> >
> > The real server 1 does not respond the arp request.
> > (arp problem is solved by hiding VIP.)
> >
> > But, I wanted to changed 172.26.20.xxx to 192.168.1.xxx :
> >
> > (Client) -----------------------------(Director )
> ---------------------------( Real server 1 )
> > any DIP: 192.168.1.111 (eth0)
> RIP : 192.168.1.112 (eth0)
> > VIP: 192.168.1.110 (eth0:1)
> VIP : 192.168.1.110 (lo:0)
> >
> > Also, at the real server 1, I configured
> >
> > echo 1 > /proc/sys/net/ipv4/ip_forward
> > ifconfig lo:0 192.168.1.110 netmask 255.255.255.255 broadcast
> 192.168.1.110 up
> > route add -host 192.168.1.110 dev lo:0
> > echo 1 > /proc/sys/net/ipv4/conf/all/hidden
> > echo 1 > /proc/sys/net/ipv4/conf/lo/hidden
> >
> > At this configuration, The real server 1 "does" respond
> > the arp request. (arp problem is not solved by hiding VIP.)
>
> This test is tricky. If your client made an arp request after the
> ifconfig command and before the echo 1 command, then then client
> will have an arp entry for the VIP and you will be able to ping
> the VIP on real-server1 till the arp cache expires (30secs-2mins).
>
> Is it possible that this is what's happening?
>
> Also how do you know that the real-server 1 did not respond in the
> first case? Did you see the MAC address for the director, but not the
> real-server? (just checking)
>
> Joe
>
> >
> > As summary, I only change the subnet from 172.26.20.xxx --->
> 192.168.1.xxx.
> > I doubt there are some reason in the fact that IP of loopback
> device (dev = lo)
> > is 172.0.0.1.
> >
> > Don't you have any same situation?
> >
> > Any comment, Thanks.
> >
> > Young C. Cho
> >
> > ----------------------------------------
> > Young Cheol Cho, Ph. D.
> >
> > jyc@xxxxxxxxxxxxxx
> > http://cisl.snu.ac.kr/~jyc
> >
> > Automation Systems Reseach Institute,
> > Seoul National Univ.,
> > Seoul, 151-742, Korea.
> > Tel : +82-2-874-8256
> > Fax: +82-2-974-8256
> > ---------------------------------------
>
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