D-Link DFL-M510 Guida all'installazione

D-Link Nordic Technical Support 1

DFL-M510 FAQ

D-Link Nordic Technical Support 2

FAQ

Q: Why does the device memory usage exceed 80% right after start-up?

Q: Why does D-Link strongly suggest not managing DFL-M510 from the Internet?

Q: Do the”Standby Hosts” disappear from the host table after rebooting?

Q: After rebooting the DFL-M510, what configuration files would disappear? (Host table? Policy?

Report? …)

Q: What would happen after the hosts exceed 150 users?

Q: How does DFFL-M510 learn the host name? Why is the host name sometimes not shown? How

often does it send the host name query?

Q: What LOG information is included in the DFL-M510?

Q: How many days of data is kept in the DFL-M510 for report?

Q: What would happen after the concurrent session exceeds 12K?

Q: What is the difference between Bypass Mode and Bypass feature (DMZ/Hosts)?

Q: How to implement the DFL-M510 in the environment with L3 device?

Q: On which occasions should I use the DMZ bypass or Host bypass? Why?

Q: How does the DFL-M510 manage internal hosts in the DHCP environment?

Q: How to deploy DFL-M510 in VLAN environment?

Q: Why is the login time so long? What factors affect this?

Q: How many groups/templates/user-defined patterns does the DFL-M510 support?

Q: What is the “Default Group” used for?

Q: Why is there Priority for each group in the DFL-M510?

Q: Are Hosts able to belong to multiple Groups at the same time?

Q: Why can the template only be applied to a pre-defined group? Why can it not be applied to a

single host?

Q: Why is the “Wizard_Template” created by Setup Wizard unable to be modified?

Q: Why does the ”Win Pop-up message” fail?

Q: Can the DFL-M510 send Pop-up messages to clients in different

Q: Why are there only 9 keyword filters in the DFL-M510?

D-Link Nordic Technical Support 3

Q: Why does RTM show no data?

Q: How many bytes are transferred from DFL-M510 to the PC for RTM?

Q: How often is the data refreshed in Real Time Application?

Q: What are the main features of RTM in DFL-M510?

Q: Is it possible to identify the victim infected malicious problem with RTM?

Q: How does H.323 work? By port? By protocol?

Q: How many P2P applications can the DFL-M510 manage?

Q: What’s the difference between HTTP and web control in real-time application?

Q: Does Web Content keyword block ASCII code content? How does it work?

Q: What is the limitation to detect and block Skype?

Q: How does “Web Download” work? Are there any constraints?

Q: Does “Web Mail” pattern only detect the URL?

Q: Is there any detail Application list spported by the DFL-M510?

Q: How does DFL-M510 manage Streaming Media Applications?

Q: Why can the DFL-M510 only block or allow Skype / QQ? Is there no granular action control?

Q: How does DFL-M510 manage normal FTP and FTP applications like GETRight/FlashGet?

Q: Is the signature unidirectional or bidirectional?

MISC

Q: What happens after DFL-M510 blocks/detects malicious traffic?

Q: Is there any SNMP Set/Get/Trap list?

D-Link Nordic Technical Support 4

System

Q: Why does the device memory usage exceed 80% right after

start-up?

A: To achieve robustness and efficiency, we do not allocate memory dynamically

(runtime) in M510. Instead, we pre-allocate almost all necessary memory space for

tables and data objects during booting up and then do the memory management by our

own program, not the Operating System. Although the memory usage looks high right

after the booting, it tends to keep stable (from 80% to 89%) without too much peaks.

Q: Why does D-Link strongly suggest not managing DFL-M510

from the Internet?

A: Since the communication between M-510 device and Java GUl could be quite

bandwidth-consumptive (especially in signature download or firmware upgrade), the

GUI communication possibly affects the upstream bandwidth and introduce more latency

to outbound traffic. Moreover, the administrator may not have smooth RTM transaction

by the way if the upstream bandwidth is quite limited.

Q: Do the”Standby Hosts” disappear from the host table after

rebooting?

A: “Standby Hosts” will disappear only if device is reset to factory default status or the

user manually removes them from UI. On the other hand, “Stand by Hosts” is stored in

non-volatile memory so that rebooting the device does not clear it either. One

noticeable technical issue is the M510 store the “Standby Hosts” temporarily in a one-

way hash table, and a host record could be overwritten by another if hash collision

happens.

D-Link Nordic Technical Support 5

Q: After rebooting the DFL-M510, what configuration files would

disappear? (Host table? Policy? Report? …)

A: The report files and User Login logs will disappear after the reboot.

Q: What would happen after the hosts exceed 150 users?

A: Dropped or forwarded immediately. This is optional by setting the configuration

“forward” or “block” flag in “Setup Host” page of UI.

Q: How does DFFL-M510 learn the host name? Why is the host

name sometimes not shown? How often does it send the host

name query?

A: DFL-M510 utilizes the WINS service to make queries for host names. Sometimes

there is no name for a host in UI host table, and it may come from the following

reasons:

It is not a Microsoft Windows platform and does not support the WINS services The host

is enabled with the firewall embedded within Microsoft Windows platform and the

firewall blocks the WINS service.

The WINS service is disabled by user

The host name query begins from the moment right after it has been learned by M-510,

and the device negotiates with the host to get a name immediately. If the first query is

failed, DFL-M51 0 will send the other two queries in a 5 minutes’ interval. If these three

queries all fail, the name learning process is closed for this host.

Q: What LOG information is included in the DFL-M510?

A: The DFL-M510 does not contain a disk to store large bulks of data for log and report,

so therefore only the necessary information for network users is saved. Only “System

Log” is saved at present.

Q: How many days of data is kept in the DFL-M510 for report?

A: DFL-M51 0 keeps 7-day reports in system memory but they will be gone if device is

reset or reboot.

D-Link Nordic Technical Support 6

Q: What would happen after the concurrent session exceeds 12K?

A: Dropped or forwarded immediately. This is optional by setting the configuration

“forward” or “block” flag in “Setup Host” page of UI.

D-Link Nordic Technical Support 7

Deployment

Q: What is the difference between Bypass Mode and Bypass

feature (DMZ/Hosts)?

A: The Bypass Mode is performed by the system software, so that the packet

information including protocol and throughput is still recorded by the device. On the

other side, the Bypass feature is implemented by the hardware engine, so that

although it’s forwarding in wire-speed high performance, there will be no related

information left.

Q: How to implement the DFL-M510 in the environment with L3

device?

A: We do not suggest a user to put any Layer 3 switch beneath the DFL-M510. Though

it will not suffer the security and control management, the host information of traffic

through the switch will be aggregated.

Q: On which occasions should I use the DMZ bypass or Host

bypass? Why?

A: The DMZ is a trust area so that we do not have to check the traffic from this area

and the high throughput is desired. The same idea is also applied for hosts. A network

administrator can insert the DMZ servers into DMZ bypass list and host into host bypass

list for the wire-speed performance from DFL-M510. (But there is no log/report for the

bypassed traffic.)

Q: How does the DFL-M510 manage internal hosts in the DHCP

environment?

A: The DFL-M510 identifies the internal hosts by their unique MAC addresses, so that

the device will provide the precise traffic information and management capability in

DHCP environments. When you enable the “MAC-Lock” feature in the host table, no

matter how the lP address change, it would bind to the same MAC address.

Q: How to deploy DFL-M510 in VLAN environment?

A: In VLAN environment, the network administrator has to set up the supporting VLAN

Group IDs (up to 8) through the DFL-M510 console or UI.

D-Link Nordic Technical Support 8

Q: Why is the login time so long? What factors affect this?

A: In Login process, the Ul (by Java applet) reads several data and system

configurations from the device and these suffer the login process. They include Network

setting, DMZ list, Bypassed hosts, Host table, Schedule, Policy file, Operation Mode,

Templates, Groups and Alert Message

D-Link Nordic Technical Support 9

Policy Setting

Q: How many groups/templates/user-defined patterns does the

DFL-M510 support?

A: Group: 10 groups

Template: 20 templates (built-in templates included)

User-defined rule: 512 rules

Q: What is the “Default Group” used for?

A: All users belong to the Default group.

Q: Why is there Priority for each group in the DFL-M510?

A: If the host belongs to multiple groups, the policy will be different. For example, John

belongs to Group A and Group B. The two group’s policies are different. DFL-M510

differentiates based on group priority.

Q: Are Hosts able to belong to multiple Groups at the same time?

A: Yes, hosts can belong to multiple groups. But the policy will be different. The policy

will depend on group priority.

Q: Why can the template only be applied to a pre-defined group?

Why can it not be applied to a single host?

A: It is true that the user cannot apply the modified rule template to a single user. The

user has to add the specified host into a host group before applying the rule template on

it. We’re doing this because we figured it’s more convenient to divide Intranet hosts into

different groups, and the administrator can define different templates accordingly. It

makes more sense to operate on group level than host level because in general there

are not many different templates in SME, and the policies applied to a host don’t tend to

change too often. Moreover, in our design a host can belong to different groups and

D-Link Nordic Technical Support 10

there’re priorities among groups. For example, the CEO of the company can be in

“Administrator” group and “Default” group in the same time. But he will only inherit the

privilege of “Administrator” group due to its higher priority. But since there’re priorities

among host groups, we don’t allow host-wise template operation because we cannot

prioritize between the single host and a host group. Indeed it introduces a little

inconvenience when applying a template to single host, but eventually the user benefits

from the host group design

Q: Why is the “Wizard_Template” created by Setup Wizard unable

to be modified?

A: This Template belongs to a pre-define template list, like the “Block all” Template. It

cannot be modified/deleted. This Template is generated by System/Setup Wizard. If you

want to modify it, please run System/Setup Wizard again.

Q: Why does the ”Win Pop-up message” fail?

A: The Windows Pop-up messages are delivered through UDP packets and this service

has low priority in Windows system. As the testing result shows, Windows system

possibly could receive the WinPop-up messages without showing them up. Moreover, If

the personal firewall is enabled in the system, the WinPop-up message could be blocked

by the firewall policies. ln addition, the WinPop-up service is able to be shutdown freely

in the target system.

Q: Can the DFL-M510 send Pop-up messages to clients in different

subnets under L3 switch?

A: WinPop-up messages are delivered by the DFL-M510 through UDP stream directly to

the target (i.e., not through the gateway, even the target is in the different subnet). So

that if the device and the target are not in the same subnet, the Win pop-up messages

will not reach to the target host.

Q: Why are there only 9 keyword filters in the DFL-M510?

A: We believe that nine filters are enough for normal situations. Performance issue is

another design consideration in this case.

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