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High availability / DHCP not working on cluster, wrong listen port
« on: August 23, 2022, 12:40:42 pm »
Hi all
I think this is a bug/issue, but maybe you can see a misconfiguration.
2 firewall in cluster, each with 6 interface:
- igb0 between the firewalls, for pfsync;
- igb1 used as emergency, I can connect a pc here and manage the firewall in worst case scenario.
- igb2->5 aggregated as lagg0 to the switch
on lagg0 there are all the vlan we need.
At the end the ifconfig output.
The dhcp server is on 2 vlan, vlan1 and vlan3.
The clients don't take the IP from dhcp, litterally they don''t receive any response from dhcp servers (wireshark).
The log file was full of
Looking aroud (can't remember really how) I found that the dhcp servers could not comunicate eachother.
The firewall rule auto-generated is in place, and also there is another manual rule who permit the traffic between firewalls on port 520 and 519 TCP.
But looking at listening port there is the mistake, both dhcp daemon was listening on port 520.
A packet capture let me see that the secondary was trying to open a tcp connection on port 519 of the primary, but primary was listening on port 520.
Looking at file /var/dhcpd/etc/dhcpd.conf, both config was to listen on 520. At the end the file of slave for reference.
So as workaround i modified the /usr/local/etc/inc/plugins.inc.d/dhcpd.inc on master for let it know it is master:
I have not take the time to read and understand the if statement.
So the question is:
Why it decide the master is not master ?
ifconfig on primary
ifconfig on secondary
DHCP config file of secondary.
I think this is a bug/issue, but maybe you can see a misconfiguration.
2 firewall in cluster, each with 6 interface:
- igb0 between the firewalls, for pfsync;
- igb1 used as emergency, I can connect a pc here and manage the firewall in worst case scenario.
- igb2->5 aggregated as lagg0 to the switch
on lagg0 there are all the vlan we need.
At the end the ifconfig output.
The dhcp server is on 2 vlan, vlan1 and vlan3.
The clients don't take the IP from dhcp, litterally they don''t receive any response from dhcp servers (wireshark).
The log file was full of
Code: [Select]
2022-08-19T17:17:27 Error dhcpd DHCPDISCOVER from 0a:c4:ad:4b:47:fd via vlan03: peer holds all free leases
2022-08-19T17:17:26 Error dhcpd DHCPDISCOVER from 68:f7:28:fc:c9:f3 via vlan01: peer holds all free leases
2022-08-19T17:17:16 Error dhcpd DHCPDISCOVER from 68:f7:28:fc:c9:f3 via vlan01: peer holds all free leasesLooking aroud (can't remember really how) I found that the dhcp servers could not comunicate eachother.
The firewall rule auto-generated is in place, and also there is another manual rule who permit the traffic between firewalls on port 520 and 519 TCP.
But looking at listening port there is the mistake, both dhcp daemon was listening on port 520.
Code: [Select]
root@fw-slave:~ # netstat -na
Active Internet connections (including servers)
Proto Recv-Q Send-Q Local Address Foreign Address (state)
[...]
tcp4 0 0 10.203.1.252.520 *.* LISTEN
tcp4 0 0 10.203.5.252.520 *.* LISTEN
[...]A packet capture let me see that the secondary was trying to open a tcp connection on port 519 of the primary, but primary was listening on port 520.
Looking at file /var/dhcpd/etc/dhcpd.conf, both config was to listen on 520. At the end the file of slave for reference.
So as workaround i modified the /usr/local/etc/inc/plugins.inc.d/dhcpd.inc on master for let it know it is master:
Code: [Select]
root@fw-master:~ # grep -B3 -A35 ZETSU /usr/local/etc/inc/plugins.inc.d/dhcpd.inc
if (!empty($dhcpifconf['failover_peerip'])) {
$intip = get_interface_ip($dhcpif, $ifconfig_details);
/* ZETSU $failover_primary = false; */
$failover_primary = true;
if (!empty($config['virtualip']['vip'])) {
foreach ($config['virtualip']['vip'] as $vipent) {
if ($vipent['interface'] == $dhcpif) {
$carp_nw = gen_subnet($vipent['subnet'], $vipent['subnet_bits']);
if (ip_in_subnet($dhcpifconf['failover_peerip'], "{$carp_nw}/{$vipent['subnet_bits']}")) {
/* this is the interface! */
if (is_numeric($vipent['advskew']) && (intval($vipent['advskew']) < 20)) {
$failover_primary = true;
}
break;
}
}
}
} else {
log_error('Warning! DHCP Failover setup and no CARP virtual IPs defined!');
}
$dhcpdconf_pri = "";
if ($failover_primary) {
$my_port = "519";
$peer_port = "520";
$type = "primary";
$dhcpdconf_pri = "split 128;\n";
if (isset($dhcpifconf['failover_split'])) {
$dhcpdconf_pri = "split {$dhcpifconf['failover_split']};\n";
}
$dhcpdconf_pri .= " mclt 600;\n";
} else {
$type = "secondary";
$my_port = "520";
$peer_port = "519";
}
I have not take the time to read and understand the if statement.
So the question is:
Why it decide the master is not master ?
ifconfig on primary
Code: [Select]
root@fw-master:~ # ifconfig
igb0: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Cluster
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:28
inet 10.203.0.1 netmask 0xfffffff8 broadcast 10.203.0.7
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb1: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Emergency
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:29
inet 192.168.23.253 netmask 0xffffff00 broadcast 192.168.23.255
media: Ethernet autoselect
status: no carrier
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb2: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:2a
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb3: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:2a
hwaddr 00:30:18:01:6c:2b
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb4: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:2a
hwaddr 00:30:18:01:6c:2c
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb5: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:2a
hwaddr 00:30:18:01:6c:2d
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
enc0: flags=0<> metric 0 mtu 1536
groups: enc
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x8
inet 127.0.0.1 netmask 0xff000000
groups: lo
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
pflog0: flags=20100<PROMISC,PPROMISC> metric 0 mtu 33160
groups: pflog
pfsync0: flags=41<UP,RUNNING> metric 0 mtu 1500
pfsync: syncdev: igb0 syncpeer: 10.203.0.2 maxupd: 128 defer: off
syncok: 1
groups: pfsync
lagg0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:6c:2a
laggproto lacp lagghash l2,l3,l4
laggport: igb2 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb3 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb4 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb5 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
groups: lagg
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan01: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Management
options=4000000<NOMAP>
ether 00:30:18:01:6c:2a
inet 10.203.5.253 netmask 0xffffff00 broadcast 10.203.5.255
inet 10.203.5.254 netmask 0xffffffff broadcast 10.203.5.254 vhid 3
groups: vlan
carp: MASTER vhid 3 advbase 1 advskew 0
vlan: 5 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan02: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: LAN
options=4000000<NOMAP>
ether 00:30:18:01:6c:2a
inet 192.168.0.213 netmask 0xffffff00 broadcast 192.168.0.255
inet 192.168.0.254 netmask 0xffffffff broadcast 192.168.0.254 vhid 4
groups: vlan
carp: MASTER vhid 4 advbase 1 advskew 0
vlan: 2 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan03: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Ospiti
options=4000000<NOMAP>
ether 00:30:18:01:6c:2a
inet 10.203.1.253 netmask 0xffffff00 broadcast 10.203.1.255
inet 10.203.1.254 netmask 0xffffffff broadcast 10.203.1.254 vhid 1
groups: vlan
carp: MASTER vhid 1 advbase 1 advskew 0
vlan: 4 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan04: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: WAN
options=4000000<NOMAP>
ether 00:30:18:01:6c:2a
inet [snip...] netmask 0xfffffff8 broadcast 185.100.109.151
inet [snip...] netmask 0xfffffffc broadcast 185.100.109.151 vhid 2
groups: vlan
carp: MASTER vhid 2 advbase 1 advskew 0
vlan: 99 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
ovpns1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
inet 192.168.203.1 --> 192.168.203.2 netmask 0xfffffff8
groups: tun openvpn
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Opened by PID 54350
ovpns2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
inet 192.168.203.33 --> 192.168.203.34 netmask 0xffffffe0
groups: tun openvpn
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Opened by PID 93215
root@fw-master:~ # ifconfig on secondary
Code: [Select]
root@fw-slave:~ # ifconfig
igb0: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Cluster
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b2
inet 10.203.0.2 netmask 0xfffffff8 broadcast 10.203.0.7
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb1: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Emergency
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b3
inet 192.168.23.252 netmask 0xffffff00 broadcast 192.168.23.255
media: Ethernet autoselect
status: no carrier
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb2: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b4
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb3: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b4
hwaddr 00:30:18:01:66:b5
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb4: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b4
hwaddr 00:30:18:01:66:b6
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
igb5: flags=8963<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b4
hwaddr 00:30:18:01:66:b7
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7
inet 127.0.0.1 netmask 0xff000000
groups: lo
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
enc0: flags=0<> metric 0 mtu 1536
groups: enc
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
pfsync0: flags=0<> metric 0 mtu 1500
groups: pfsync
pflog0: flags=20100<PROMISC,PPROMISC> metric 0 mtu 33160
groups: pflog
lagg0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=4800028<VLAN_MTU,JUMBO_MTU,NOMAP>
ether 00:30:18:01:66:b4
laggproto lacp lagghash l2,l3,l4
laggport: igb2 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb3 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb4 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
laggport: igb5 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
groups: lagg
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan01: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Management
options=4000000<NOMAP>
ether 00:30:18:01:66:b4
inet 10.203.5.252 netmask 0xffffff00 broadcast 10.203.5.255
inet 10.203.5.254 netmask 0xffffffff broadcast 10.203.5.254 vhid 3
groups: vlan
carp: BACKUP vhid 3 advbase 1 advskew 100
vlan: 5 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan02: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: LAN
options=4000000<NOMAP>
ether 00:30:18:01:66:b4
inet 192.168.0.212 netmask 0xffffff00 broadcast 192.168.0.255
inet 192.168.0.254 netmask 0xffffffff broadcast 192.168.0.254 vhid 4
groups: vlan
carp: BACKUP vhid 4 advbase 1 advskew 100
vlan: 2 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan03: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: Ospiti
options=4000000<NOMAP>
ether 00:30:18:01:66:b4
inet 10.203.1.252 netmask 0xffffff00 broadcast 10.203.1.255
inet 10.203.1.254 netmask 0xffffffff broadcast 10.203.1.254 vhid 1
groups: vlan
carp: BACKUP vhid 1 advbase 1 advskew 100
vlan: 4 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
vlan04: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: WAN
options=4000000<NOMAP>
ether 00:30:18:01:66:b4
inet [snip...] netmask 0xfffffff8 broadcast 185.100.109.151
inet [snip...] netmask 0xfffffffc broadcast 185.100.109.151 vhid 2
groups: vlan
carp: BACKUP vhid 2 advbase 1 advskew 100
vlan: 99 vlanproto: 802.1q vlanpcp: 0 parent interface: lagg0
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
ovpns1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
inet 192.168.203.1 --> 192.168.203.2 netmask 0xfffffff8
groups: tun openvpn
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Opened by PID 30516
ovpns2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1500
options=80000<LINKSTATE>
inet 192.168.203.33 --> 192.168.203.34 netmask 0xffffffe0
groups: tun openvpn
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Opened by PID 30997
DHCP config file of secondary.
Code: [Select]
root@fw-slave:~ # cat /var/dhcpd/etc/dhcpd.conf
option domain-name "dave.lan";
option ldap-server code 95 = text;
option arch code 93 = unsigned integer 16; # RFC4578
option pac-webui code 252 = text;
default-lease-time 7200;
max-lease-time 86400;
log-facility local7;
one-lease-per-client true;
deny duplicates;
ping-check true;
update-conflict-detection false;
authoritative;
failover peer "dhcp_opt4" {
secondary;
address 10.203.1.252;
port 520;
peer address 10.203.1.253;
peer port 519;
max-response-delay 10;
max-unacked-updates 10;
load balance max seconds 3;
}
failover peer "dhcp_opt2" {
secondary;
address 10.203.5.252;
port 520;
peer address 10.203.5.253;
peer port 519;
max-response-delay 10;
max-unacked-updates 10;
load balance max seconds 3;
}
subnet 10.203.1.0 netmask 255.255.255.0 {
pool {
option domain-name-servers 10.203.1.254;
deny dynamic bootp clients;
failover peer "dhcp_opt4";
range 10.203.1.100 10.203.1.199;
}
option routers 10.203.1.254;
option domain-name-servers 10.203.1.254;
}
subnet 10.203.5.0 netmask 255.255.255.0 {
pool {
option domain-name-servers 10.203.5.254;
deny dynamic bootp clients;
ignore-client-uids true;
failover peer "dhcp_opt2";
range 10.203.5.100 10.203.5.109;
}
option routers 10.203.5.254;
option domain-name-servers 10.203.5.254;
}