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ServerIron ADX Advanced Server Load Balancing Guide 39
53-1002435-01
Sample Deployment Topologies
2
In flow 1b, the ServerIron ADX changes the source address to a configured IP address. The
ServerIron ADX applies source NAT to the requests going from the ServerIron ADX to the cache
server. Table 2 illustrates the CAM programming for this example.
VIPs with reverse proxy
In the following example, SLB is configured and one or more of the virtual ports have Reverse Proxy
SLB enabled (cache-enable). This is usually the case with server side caching topologies, when the
cache server is running in transparent mode. This means that traffic destined to that particular VIP
will be redirected to the cache server. If the cache server does not have the requested data, it
makes a connection to the VIP, which is then load balanced across the real servers, and retrieves
the data.
NOTE
FTP is not supported for TCS with source NAT.
The above diagram illustrates the packet flow in a TCS configuration with a VIP that has Reverse
Proxy SLB enabled. Flow 1 shows the client request getting forwarded to the cache server. If the
cache server has the required information, it is sent to the client via flow 4. If the flows cache
server does not have the information, it accesses the VIP via flow 2 and the traffic from the load
balanced real server to the cache server comes from flow 3.
TABLE 2 Required CAM programming for simple TCS with Source NAT configuration
Level Match Hash
1 Source NAT IP address Destination port
2 Destination port Source IP address
Source port Destination IP address
Client
CIP
1a(CIP-VIP)
4b(VIP-CIP)
4a(VIP-CIP)
1b(CIP-VIP)
3a(RIP-TIP)
3b(VIP-TIP)
2b(TIP-RIP)
2a(TIP-VIP)
CIP-Client IP Address
RIP-Real Server IP Address
VIP-Virtual IP Address
TIP-Cache Server IP Address
ServerIron
VIP
Real Server
RIP
Transparent
Cache Server
TIP
Cache enable
Configuration
- ServerIron ADX 1
- Document History 2
- Contents 5
- About This Document 9
- Command syntax conventions 10
- Notice to the reader 11
- Related publications 11
- Web access 12
- E-mail and telephone access 12
- SIP Server Load Balancing 13
- SIP terminology 16
- SIP message headers 17
- Max-Forwards 18
- Sample deployment topologies 19
- RINGING F4 21
- Configuring SIP SLB 23
- Configuring health check 26
- Example 29
- Load Balancing SIP over TCP 31
- Call-ID3 33
- Call-ID1 34
- Rehashing the SIP hash table 38
- Debug commands 40
- SIP SLB command reference 42
- Sample configuration 43
- Transparent Cache Switching 45
- Stateful caching 47
- Sample Deployment Topologies 48
- TCS with spoofing 49
- TCS with destination NAT 49
- TCS with Source NAT 50
- VIPs with reverse proxy 51
- Configuring TCS 52
- Defining a cache server 53
- Enabling TCS 56
- Other TCS options 57
- Cache Route Optimization 58
- Enabling Destination NAT 62
- Configuring Source NAT 62
- Examples 64
- Distribution algorithm 66
- • Maximum connection rate 72
- Enabling FastCache 73
- Enabling remote cache 73
- Shutting down a cache server 74
- Passive FTP for TCS 75
- Traffic flow of passive FTP 76
- Topologies supported 76
- High availability support 77
- ServerIron ADX 2 78
- Policy based caching 79
- Show commands 81
- Content aware cache switching 82
- Setting up the CSW policies 84
- Configuring the cache servers 85
- This field... Displays 91
- Displaying cache information 95
- TCS information (Continued) 96
- Sample configurations 98
- Applying IP policies 99
- Defining the caches 99
- Defining the cache groups 100
- 53-1002435-01 101
- Policy-based caching 102
- Asymmetric TCS (FastCache) 103
- Policy-based cache failover 105
- TCS with reverse proxy 107
- Layer 3 TCS 109
- Basic TCS configuration 110
- Commands for ServerIron ADX A 111
- Commands for ServerIron ADX B 112
- Internet 114
- 10.10.20.104 114
- 10.10.20.102 114
- Router NI1 117
- Router NI2 117
- OSPF Area 0 117
- Commands for Router NI2 121
- Active-standby TCS 125
- Configuring Router R1 126
- Configuring ServerIron ADX A 126
- Configuring ServerIron ADX B 127
- NetCache servers 128
- NetCache C720 cache server 128
- TABLE 9 Hashing methods 130
- Parsing the host string 133
- Force rehash 136
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