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Configuring Application Layer Gateways for DS-Lite
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Application Layer Gateway for SIP Protocol
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Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
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Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
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Application Layer Gateway for SIP Protocol
Using DS-Lite with Session Initiation Protocol (SIP) is complicated, because SIP messages contain IP addresses in the SIP headers as well as in the SIP body. When LSN is used with SIP, the SIP headers contain information about the caller and the receiver, and the device translates this information to hide it from the outside network. The SIP body contains the Session Description Protocol (SDP) information, which includes IP addresses and port numbers for transmission of the media. SIP ALG for DS-Lite is compliant with RFC 3261, RFC 3581, RFC 4566, and RFC 4475.
Limitations of SIP ALG
SIP ALG for DS-Lite has the following limitations:
- Only SDP payload is supported.
- The following are not supported:
- Multicast IP addresses
- Encrypted SDP
- SIP TLS
- FQDN translation
- SIP layer authentication
- Admin partitions
- Citrix ADC clusters
- Multipart body
- Line folding
Configuring SIP ALG
You need to configure the SIP ALG as part of the LSN configuration. For instructions on configuring LSN, see Configuring DS-Lite. While configuring LSN, make sure that you:
- Set the following parameters while adding an LSN application profile:
o IP Pooling = PAIRED
o Address and Port Mapping = ENDPOINT-INDEPENDENT
o Filtering = ENDPOINT-INDEPENDENT
- Create a SIP ALG profile and make sure that you define either the source port range or destination port range. Bind the SIP ALG profile to the LSN group
- Enable SIP ALG in the LSN group
To enable SIP ALG for an LSN configuration by using the CLI
At the command prompt, type:
add lsn group <groupname> -clientname <string>[-sipalg ( ENABLED | DISABLED )]
show lsn group<groupname>
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To enable SIP ALG for an LSN configuration by using the CLI
At the command prompt, type:
add lsn sipalgprofile<sipalgprofilename>[-dataSessionIdleTimeout<positive_integer>][-sipSessionTimeout<positive_integer>][-registrationTimeout<positive_integer>][-sipsrcportrange<port[-port]>][-sipdstportrange<port[-port]>][-openRegisterPinhole ( ENABLED | DISABLED )][-openContactPinhole ( ENABLED | DISABLED )][-openViaPinhole ( ENABLED | DISABLED )][-openRecordRoutePinhole ( ENABLED | DISABLED )]-sipTransportProtocol ( TCP | UDP )[-openRoutePinhole ( ENABLED | DISABLED )][-rport ( ENABLED | DISABLED )]
show lsn sipalgprofile<sipalgprofilename>
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Sample Configuration
The following sample DS-Lite configuration, SIP ALG is enabled for TCP traffic from B4 devices in the network 2001:DB8::3:0/96.
add lsn client LSN-DSLITE-CLIENT-1
Done
bind lsn client LSN-DSLITE-CLIENT-1 -network6 2001:DB8::3:0/96
Done
add lsn pool LSN-DSLITE-POOL-1
Done
bind lsn pool LSN-DSLITE-POOL-1 203.0.113.61 - 203.0.113.70
Done
add lsn ip6profile LSN-DSLITE-PROFILE-1 -type DS-Lite -network6 2001:DB8::5:6
Done
add lsn appsprofile LSN-DSLITE-APPS-PROFILE-1 TCP -ippooling PAIRED –mapping ENDPOINT-INDEPENDENT -filtering ENDPOINT-INDEPENDENT
Done
add lsn sipalgprofile SIPALGPROFILE-1 -sipdstportrange 5060 -sipTransportProtocol TCP
Done
add lsn group LSN-DSLITE-GROUP-1 -clientname LSN-DSLITE-CLIENT-1 -portblocksize 1024 -ip6profile LSN-DSLITE-PROFILE-1 -sipalg ENABLED
Done
bind lsn group LSN-DSLITE-GROUP-1 -poolname LSN-DSLITE-POOL-1
Done
bind lsn group LSN-DSLITE-GROUP-1 -appsprofilename LSN-DSLITE-APPS-PROFILE-1
Done
bind lsn group LSN-DSLITE-GROUP-1 -sipalgprofilename SIPALGPROFILE-1
Done
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