Page 211 / 234
Scroll up to view Page 206 - 210
USER MANUAL
Peplink Balance Series
-211 / 234 -
Copyright © 2014 Peplink
B.2
Routing via IP Forwarding
When Peplink Balance is operating under IP Forwarding mode, the IP addresses of IP packets are
unchanged; Peplink Balance forwards both inbound and outbound IP packets without changing their IP
addresses.
The following figure shows the packet flow in IP Forwarding mode:
Page 212 / 234
USER MANUAL
Peplink Balance Series
-212 / 234 -
Copyright © 2014 Peplink
Appendix C. Case Studies
C.1
Performance Optimization
C.1.1 Scenario
In this scenario, email and web browsing are the two main Internet services used by the LAN users.
The mail server is external to the network. The connections are ADSL (WAN1, with slow uplink and fast
downlink) and Metro Ethernet (WAN2, symmetric).
C.1.2 Solution
For optimal performance with this configuration, individually set the WAN load balance according to the
characteristics of each service.
Web browsing mainly downloads data; sending e-mails mainly consumes upload bandwidth.
Both connections offer good download speeds; WAN2 offers good upload speeds.
Define WAN1 and WAN2's inbound and outbound bandwidths to be 3M/512k and 4M/4M
respectively. This will ensure that outbound traffic is more likely to be routed through WAN2.
For HTTP, set the weight to 3:4.
For SMTP, set the weight to 1:8, such that users will have a greater chance to be routed via
WAN2 when sending e-mail.
C.1.3 Settings
1.
Add a new outbound traffic rule for HTTP.
2.
Add a new outbound traffic rule for SMTP.
In general, to add a new outbound traffic rule, navigate to
Network>Outbound Policy
.
Click
Add Rule
to
add a new load
distribution rule.
Click here and Select
Managed
by Custom Rules
Page 214 / 234
USER MANUAL
Peplink Balance Series
-214 / 234 -
Copyright © 2014 Peplink
C.2
Maintaining the Same IP Address throughout a Session
C.2.1 Scenario
Some IP address sensitive web sites (for example, Internet banking) use both client IP address and
cookie matching for session identification. Since load balancing uses different IP addresses, the session
is dropped when a mismatching IP is detected resulting in frequent interruptions while visiting such sites.
C.2.2 Solution
Make use of the Persistency functionality of Peplink Balance. With Persistence configured and the
By
Destination
option selected, the Peplink Balance will use a consistent WAN connection for source-
destination pairs of IP addresses, preventing sessions from being dropped.
With Persistence is configured and the option
By Source
is selected, Peplink Balance uses a consistent
WAN connection for same source IP addresses. This option offers higher application compatibility, but
may inhibit the load balancing function unless there are many clients using the internet.
C.2.3 Settings
Set persistence in:
Network> Outbound Policy
Click
Add Rule
, select
HTTP
(TCP port 80) for web service, and select
Persistence
. Click
Save
and then
Click
Apply Changes
on the top right corner to complete the process.
Tip
A network administrator can use the Traceroute utility to manually analyze the connection path of a particular WAN
connection.
Page 215 / 234
USER MANUAL
Peplink Balance Series
-215 / 234 -
Copyright © 2014 Peplink
C.3
Bypassing the Firewall to Access Hosts on LAN
C.3.1 Scenario
There are times when remote access to computers on the LAN is desirable; for example, when hosting
web sites, online businesses and FTP download and upload areas, etc.
In such cases, it may be appropriate to create an inbound NAT mapping for the network to allow some
hosts on the LAN to be accessible from outside of the firewall.
C.3.2 Solution
The Web Admin Interface can be used to add an inbound NAT mapping to a host and to bind the host to
the WAN connection(s) of your choice. To begin, navigate to
Network>NAT Mappings>AddNAT Rule
.
In this example, the host with an IP address of
192.168.1.102 is bound to 211.123.123.100 of WAN1:
Click
Apply Changes
on the top right corner to complete the process.
19216811.live