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Re: Unable to forward packets

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: Unable to forward packets
From: Christophe Mailhebuau <christophe.mailhebuau@xxxxxxxxxx>
Date: Wed, 22 Feb 2006 15:55:55 +0100
Le 21/02/06 at  13:27, Bill Omer a ecrit:
>Hello all
>
>I'm attempting to get LVS installed and working and I'm having some
>trouble.  I've been doing allot of reading and I'm not able to find a
>solution to my problem on my own.  I was hoping that someone on here may be
>able to shed some light on the subject and possibly point out what I'm doing
>wrong.
>
>I want to apologize in advanced for the length of this message.
>
>I have ipvsadm installed and the ip_vs modules are loaded.  I'm using
>rhel3as.
>
>I'm doing the following
>
>The server running lvs with eth0 being its rip and the vip is bound to
>eth0:0.
>
>logbash-2.03# ifconfig
>eth0      Link encap:Ethernet  HWaddr 00:13:21:B3:65:6A
>          inet addr:10.26.66.97  Bcast:10.26.67.255  Mask:255.255.254.0
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:10959 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:3166 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:3310081 (3.1 Mb)  TX bytes:1230650 (1.1 Mb)
>          Interrupt:25
Broadcast is good ?

>
>eth0:0    Link encap:Ethernet  HWaddr 00:13:21:B3:65:6A
>          inet addr:10.26.66.101  Bcast:10.26.66.101  Mask:255.255.255.255
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>          Interrupt:25
>
>
>
>ipvsadm -A -t lvs-vip:23 -s wlc
>ipvsadm -a -t lvs-vip:23 -r test-rs -g
>echo 1 > /proc/sys/net/ipv4/ip_forward
>route add -host 10.26.66.101 dev eth0:0
>
>
>On the box I'm calling test-rs, I'm doing the following
>ifconfig lo:0 lvs-vip netmask 255.255.255.255 broadcast lvs-vip up
>echo 1 >/proc/sys/net/ipv4/ip_forward
>route add -host lvs-vip dev lo:0
>
>On the test-rs box, my ifconfig is this:
>
>bomer.desktop$ ifconfig
>eth0      Link encap:Ethernet  HWaddr 00:12:3F:66:98:A5
>          inet addr:10.26.94.121  Bcast:10.26.95.255  Mask:255.255.252.0
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:35 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:49 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:6815 (6.6 Kb)  TX bytes:6271 (6.1 Kb)
>          Interrupt:11

Broadcat is good ?

>lo        Link encap:Local Loopback
>          inet addr:127.0.0.1  Mask:255.0.0.0
>          UP LOOPBACK RUNNING  MTU:16436  Metric:1
>          RX packets:119045 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:119045 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:7982890 (7.6 Mb)  TX bytes:7982890 (7.6 Mb)
>
>lo:0      Link encap:Local Loopback
>          inet addr:10.26.66.101  Mask:255.255.255.255
>          UP LOOPBACK RUNNING  MTU:16436  Metric:1
>          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:0
>          RX bytes:900 (900.0 b)  TX bytes:0 (0.0 b)
>
>
>
>
>To troubleshoot this, I'm running 'tcpdump -ln port 23'    on the lvs server
>and the test-rs machine.  On the lvs server, I get the following when I try
>to telnet to the vip from a 3 machine
>
>21:14:04.278916 10.26.66.66.29427 > 10.26.66.101.telnet: S
>2084871663:2084871663(0) win 5840 <mss 1460,sackOK,timestamp 101529036
>0,nop,wscale 0> (DF) [tos 0x10]
>21:14:04.278929 10.26.66.66.29427 > 10.26.66.101.telnet: S
>2084871663:2084871663(0) win 5840 <mss 1460,sackOK,timestamp 101529036
>0,nop,wscale 0> (DF) [tos 0x10]
>21:14:04.278974 10.26.66.66.29427 > 10.26.66.101.telnet: S
>2084871663:2084871663(0) win 5840 <mss 1460,sackOK,timestamp 101529036
>0,nop,wscale 0> (DF) [tos 0x10]  [ttl 1]
>21:14:04.278980 10.26.66.66.29427 > 10.26.66.101.telnet: S
>2084871663:2084871663(0) win 5840 <mss 1460,sackOK,timestamp 101529036
>0,nop,wscale 0> (DF) [tos 0x10]  [ttl 1]
>
>
>
>I dont see anything at all from the test-rs machine's tcpdump output.  And
>from the client, I get
>
>nfs-101$ telnet lvs-vip
>Trying 10.26.66.101...
>telnet: connect to address 10.26.66.101: No route to host
>telnet: Unable to connect to remote host: No route to host
>
>
>Here is a list of the modules I inserted:
>logbash-2.03# lsmod | grep ip
>ip_vs_wlc               1284   1
>ip_vs                  68192   2  [ip_vs_wlc]
>ipip                    9540   0  (unused)
>ipt_LOG                 4344   2  (autoclean)
>iptable_filter          2444   1  (autoclean)
>ipt_MARK                1400   1  (autoclean)
>iptable_mangle          2776   1  (autoclean)
>ip_tables              16544   4  [ipt_LOG iptable_filter ipt_MARK
>iptable_mangle]
>
>
>
>
>I'd be greatly appreciative to anyone who is able to offer any insight to my
>problem.
>
>Regards,
>Bill Omer
>bill.omer@xxxxxxxxx
fin du message de Bill Omer

-- 
Cordialement,
Christophe Mailhebuau 
Administrateur systèmes GNU/Linux 
Steria Aquitaine
GPG/fingerprint: 71A0 8348 154A EB5F 8E09 4C56 6D1D 6A3B 8C49 8C50

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