Alteon Application Switch Operating System Application Guide
Server Load Balancing
198 Document ID: RDWR-ALOS-V2900_AG1302
DSR requires that the server be set up to receive frames that have a destination IP address that is
equal to the virtual server IP address.
How Direct Server Return Works
The sequence of steps that are executed in DSR are illustrated in Figure 32 - Direct Server Return,
page 198:
Figure 32: Direct Server Return
1. A client request is forwarded to Alteon.
2. Because only MAC addresses are substituted, Alteon forwards the request to the best server,
based on the configured load-balancing policy.
3. The server responds directly to the client, bypassing Alteon, and using the virtual server IP
address as the source IP address.
To set up DSR
One Arm Topology Application
Source MAC Address Substitution
By default, in packets destined for servers in an SLB environment, the source MAC address is not
modified and the client request is forwarded to the server with the MAC address of the client. You
can substitute the client source MAC address for the packets going to the server with the Alteon MAC
address using source MAC address substitution.
You can enable this feature globally (using the /cfg/slb/adv/submac enable command), or
per-real service (using the
/cfg/slb/real/adv/submac enable command). Global MAC
address substitution supersedes per-real service MAC address substitution.
>> # /cfg/slb/real <real server number>/adv/submac ena
>> # /cfg/slb/virt <virtual server number>/service <service number>/nonat ena
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