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64 ServerIron ADX Advanced Server Load Balancing Guide
53-1002435-01
Other TCS options
2
Traffic flow of passive FTP
Using normal or passive FTP, a client begins a session by sending a request to communicate
through TCP port 21, the port that is conventionally assigned for this use at the FTP server. This
communication is known as the Control Channel connection.
Using passive FTP, a PASV command is sent instead of a PORT command. Instead of specifying a
port that the server can send to, the PASV command asks the server to specify a port it wishes to
use for the Data Channel connection. The server replies on the Control Channel with the port
number which the client then uses to initiate an exchange on the Data Channel. The server will
thus always be responding to client-initiated requests on the Data Channel and the firewall can
co-relate these.
FIGURE 12 Traffic flow for passive FTP
Topologies supported
The following topologies are supported by Passive FTP for TCS on the ServerIron ADX as described.
• Basic TCS
• TCS with spoofing
Basic TCS
Figure 13 shows the packet flow in a basic TCS configuration. In this example, flows 1 and 2 are the
control channel and data channel between the client and cache servers. Both flows are opened by
the client. If the cache server doesn't have the information, it establishes flows 3 and 4 which are
the control channel and data channel between the cache server and the real server.
FIGURE 13 Basic TCS for passive FTP
SYN
SYN ACK
Port X
Port X
Port X
Port 21
Port 21
Port 21
ACK
Port X
Port X
Port 21
Port 21
PASV
PASV OK, IP address, Port Y
SYN
SYN ACK
ACK
Port Z
Port Z
Port Z
Port Y
Port Y
Port Y
Port Z Port 21
LIST, RETR, or STOR
Data segments and ACKs
Port Z
Port Y
FTP Client
User lists directory or gets or puts a le
FTP Server
- 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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