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SIP/UDP load-balancing with Call-ID session management
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The "sipp" utility called for health-checking comes with the Debian package "sip-tester" (install with "sudo apt-get install sip-tester").
The Master Configuration File
The configurationes uses the following BalanceNG V3 extensions (also highlighted in bold):
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The module chain vrrp,arp,ping,hc,master,slb,tnat,nat,rt is the BalanceNG V3 standard module chain.
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server 1 sessionid sip associates the SIP Call-ID session handler to virtual server 1.
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target 1 sessionid sip and target 2 sessionid sip do the same for the targets.
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target 1 screate enable and target 2 screate enable allow session creation in the reverse direction
by packets initially coming from the target side. This is working because a non-DSR setup is used (where
packets are passing BalanceNG also on the return path).
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Only the configuration of the master node is shown here.
// configuration taken Fri Sep 4 09:34:34 2009
// BalanceNG 3.036 (created 2009/09/03)
modules vrrp,arp,ping,hc,master,slb,tnat,nat,rt
set ipforwarding 1
interface bond0
interface eth1
vrrp {
vrid 1
priority 255
network 2
}
network 1 {
name LAN
addr 172.17.40.0
mask 255.255.255.0
real 172.17.40.7
virt 172.17.40.8
interface bond0
}
network 2 {
name WAN
addr 10.31.40.32
mask 255.255.255.240
real 10.31.40.42
virt 10.31.40.43
interface eth1
}
register networks 1,2
enable networks 1,2
gateway {
ipaddr 10.31.40.33
}
server 1 {
ipaddr 10.31.40.43
port 5060
protocol udp
sessionid sip
stimeout 10
targets 1,2
}
server 2 {
ipaddr 10.31.40.43
port 80
protocol tcp
method session
target 3
}
register servers 1,2
enable servers 1,2
target 1 {
name "SIP 5060"
ipaddr 172.17.40.6
port 5060
protocol udp
script "/usr/bin/sipp -sf /home/sip/client_check.xml -m 1 -nr -recv_timeout 3000 $ipaddr$:$port$",2,10
screate enable
sessionid sip
}
target 2 {
name "SIP 5060"
ipaddr 172.17.40.14
port 5060
protocol udp
script "/usr/bin/sipp -sf /home/sip/client_check.xml -m 1 -nr -recv_timeout 3000 $ipaddr$:$port$",2,10
screate enable
sessionid sip
}
target 3 {
name "HTTP"
ipaddr 172.17.40.5
port 80
protocol tcp
ping 3,10
}
register targets 1,2,3
enable targets 1,2,3
// end of configuration
Contents of clientcheck.xml as referenced by the sipp Health Check
<?xml version="1.0" encoding="ISO-8859-1" ?>
<scenario name="client check">
<send>
<![CDATA[
OPTIONS sip:bng_health_check@inlab.de:[remote_port] SIP/2.0
Via: SIP/2.0/[transport] [local_ip]:[local_port]
Max-Forwards: 70
To: <sip:bng_health_check@inlab.de:[remote_port]>
From: <sip:bng_health_check@inlab.de:[local_port]>;tag=[call_number]
Call-ID: [call_id]
CSeq: [cseq] OPTIONS
Contact: sip:bng_health_check@inlab.de:[local_port]
Accept: application/sdp
Content-Length: [len]
]]>
</send>
<recv response="200">
</recv>
</scenario>
Please contact us in case of any questions, errors or suggestions
at info@inlab.de.
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