[Keepalived-devel] multicast packets not sent by lvs director

SourceForge Headquarters 1320 Columbia Street Suite 310 San Diego, CA 92101 +1 (858) 422-6466

Hi all,

I have a problem with VRRP and keepalived.
I have 2 lvs director : foo.toto.net and bar.toto.net

foo.toto.net  is the master on vrrp instance called LVS_F and backup for 
LVS_B.
bar.toto.net  is the master on vrrp instance called LVS_B and backup for 
LVS_F.

My architecture have diffculties to be in a stable state, foo becomes 
master on the 2 vrrp instance, but bar is present and conversely.
I have seen when i capture multicast packets when the problem occurs, 
one of the machine dont send multicast packets and consequently the 
other machine becomes master on the 2 vrrp instance.

I have try keepalived 1.1.10 and 1.1.7.
Linux kernel 2.6.11.6 and 2.6.4 ( with Alexandre's /IPVS syncd patch ).*
*/Ipvsadm 1.21 and 1.24 ( with Alexandre's IPVS syncd patch ).
I have also test with a various range of advertisement interval ...

But i have always the same problem ...

Here is a  sample of the dump :
# tcpdump -i eth1 host VRRP.MCAST.NET
09:53:05.462913 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 150, authtype simple, intvl 30s, length 32
09:53:09.990943 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52
09:54:05.473720 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 150, authtype simple, intvl 30s, length 32
09:54:10.002822 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52
09:54:35.479147 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 150, authtype simple, intvl 30s, length 32
09:54:40.008214 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52
09:55:05.484542 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 150, authtype simple, intvl 30s, length 32
09:55:10.013618 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52
09:55:35.489940 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 150, authtype simple, intvl 30s, length 32
09:55:35.490474 IP bar.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 200, authtype simple, intvl 30s, length 32
09:55:40.019022 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52
09:56:35.501441 IP bar.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 4, prio 200, authtype simple, intvl 30s, length 32
09:56:40.029819 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52
09:57:10.035240 IP foo.toto.net > VRRP.MCAST.NET: VRRPv2, Advertisement, 
vrid 5, prio 200, authtype simple, intvl 30s, length 52

# tail -f /var/log/everything/mesg.log | grep Keepalived_vrrp
09:53:35 bar Keepalived_vrrp: VRRP_Instance(LVS_B) Transition to MASTER 
STATE
09:54:05 bar Keepalived_vrrp: VRRP_Instance(LVS_B) Entering MASTER STATE
09:54:34 bar Keepalived_vrrp: VRRP_Instance(LVS_B) Received lower prio 
advert, forcing new election
09:55:04 bar Keepalived_vrrp: VRRP_Instance(LVS_B) Received lower prio 
advert, forcing new election
09:55:34 bar Keepalived_vrrp: VRRP_Instance(LVS_B) Received lower prio 
advert, forcing new election

Bar try to recover his mastership on his vrrp instance but, because he 
dont sent multicast packet he cant recovered it.

# tail -f /var/log/messages | grep Keepalived_vrrp
09:53:04 foo Keepalived_vrrp: VRRP_Instance(LVS_B) Transition to MASTER 
STATE
09:53:09 foo Keepalived_vrrp: VRRP_Instance(LVS_F) Transition to MASTER 
STATE
09:53:34 foo Keepalived_vrrp: VRRP_Instance(LVS_B) Entering MASTER STATE
09:53:39 foo Keepalived_vrrp: VRRP_Instance(LVS_F) Entering MASTER STATE
09:55:34 foo Keepalived_vrrp: VRRP_Instance(LVS_B) Received higher prio 
advert
09:55:34 foo Keepalived_vrrp: VRRP_Instance(LVS_B) Entering BACKUP STATE
09:58:05 foo Keepalived_vrrp: VRRP_Instance(LVS_B) Transition to MASTER 
STATE
09:58:35 foo Keepalived_vrrp: VRRP_Instance(LVS_B) Entering MASTER STATE

keepalived.conf on foo :
!------------------------------------------------------!
! LVS_F ( foo.toto.net ) MASTER MODE !
!------------------------------------------------------!
vrrp_instance LVS_F {
  state MASTER
  interface eth1
  virtual_router_id 5
  priority 200
  advert_int 30
  authentication {
    auth_type PASS
    auth_pass agfzfefazf
  }
  virtual_ipaddress {
          1.2.3.4
          1.2.3.5
          1.2.3.6
  }
}

!------------------------------------------------------!
! LVS_B ( foo.toto.net ) BACKUP MODE !
!------------------------------------------------------!
vrrp_instance LVS_B {
  state BACKUP
  interface eth1
  virtual_router_id 4
  priority 150
  advert_int 30
  authentication {
    auth_type PASS
    auth_pass agfzfefazf
  }
  virtual_ipaddress {
          1.2.3.7
          1.2.3.8
          1.2.3.9
  }
}

keepalived.conf on bar :
!-------------------------------------------------------!
! LVS_B ( bar.toto.net ) BACKUP MODE !
!-------------------------------------------------------!
vrrp_instance LVS_F {
  state BACKUP
  interface eth1
  virtual_router_id 5
  priority 150
  advert_int 30
  authentication {
    auth_type PASS
    auth_pass agfzfefazf
  }
  virtual_ipaddress {
          1.2.3.4
          1.2.3.5
          1.2.3.6
  }
}

!-------------------------------------------------------!
! LVS_F ( bar.toto.net ) MASTER MODE !
!-------------------------------------------------------!
vrrp_instance LVS_B {
  state MASTER
  interface eth1
  virtual_router_id 4
  priority 200
  advert_int 30
  authentication {
    auth_type PASS
    auth_pass agfzfefazf
  }
  virtual_ipaddress {
          1.2.3.7
          1.2.3.8
          1.2.3.9
  }
}

Any help will be appreciated.
Thx

Regards,

Nicolas