|
On Thursday 30 September 2010 17:58:20 Michael Schhwartzkopff wrote:
> Hi,
>
> I see a strange behaviour if I configure the fallback server on the
> director. I always get a TCP-RST from one real server if all servers are
> down:
>
> ldirectord.cf:
> virtual=192.168.10.140:25
> real=192.168.10.137:25 gate
> real=192.168.10.138:25 gate
> fallback=localhost:25
>
> ipvs -L
> TCP 192.168.10.140:smtp wlc persistent 600
> -> localhost:smtp Local 1 0 0
> -> 192.168.10.137:smtp Route 0 0 2
> -> 192.168.10.138:smtp Route 0 0 0
>
> tcpdump of the communication:
> 1) Client request:
> 00:27:13:64:63:ba > 08:00:27:92:13:72, ethertype IPv4 (0x0800), length 74:
> 192.168.10.143.33833 > 192.168.10.140.25: Flags [S], seq 2111034864, win
> 5840, options [mss 1460,sackOK,TS val 14078063 ecr 0,nop,wscale 6], length
> 0
>
> 2) The director forwards the request
> 08:00:27:92:13:72 > 08:00:27:51:7e:48, ethertype IPv4 (0x0800), length 74:
> 192.168.10.143.60121 > 192.168.10.140.25: S 244790748:244790748(0) win 5840
> <mss 1460,sackOK,timestamp 14116651 0,nop,wscale 6>
>
> 3) The real server denies it:
> 08:00:27:51:7e:48 > 00:27:13:64:63:ba, ethertype IPv4 (0x0800), length 54:
> 192.168.10.140.25 > 192.168.10.143.33833: Flags [R.], seq 0, ack
> 2111034865, win 0, length 0
>
> Please note that ...:ba is the MAC of my client, ...72 is the MAC of my
> director and ...48 is the MAC of my first real server.
>
> sysctl of the real server:
> sysctl -p
> net.ipv4.conf.eth0.arp_ignore = 1
> net.ipv4.conf.eth0.arp_announce = 2
> net.ipv4.conf.all.arp_ignore = 1
> net.ipv4.conf.all.arp_announce = 2
>
>
> Why does the REAL server answer this connection? Why does the director
> forward this connection to the real server.
I forget about persistency!!!
Sorry for the niose.
--
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München
Tel: (0163) 172 50 98
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/
LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
|
