User's Manual

Chapter 12 Firewall
B222s User’s Guide
111
12.5 The DoS Screen
Click Secur it y > Fire w all > DoS t o display the following screen. Use t his screen t o enable or
disable Denial of Service ( DoS) protect ion.
Figure 65 Secur it y > Firewall > DoS
Dest inat ion I P
Address St art
Enter an I P address or t he st art ing I P address of t he destination I P range.
Dest inat ion I P
Address End
Enter t he ending I P address of the destinat ion I P range.
Select Prot ocol Select t he nam e of a configured service or select Se lect Ser vice to define a new service
in t his screen.
Prot ocol This field is available when you select Select Serv ice in Se le ct Pr ot ocol.
Choose the prot ocol t ype (TCP, UDP, I CMP or Ot he r s) of t he service.
Prot ocol Num ber This field is available when you select Ot he r s in Prot ocol.
Enter t he pr otocol num ber of the service type to w hich t his ACL rule applies.
Source Port This field is displayed only when you select Select Ser vice in Sele ct Pr otocol and TCP
or UDP in Prot ocol.
Select Single or Ra nge and t hen ent er a single port num ber or the range of port
num bers of the source. Select An y t o indicat e any source port.
Dest inat ion Por t This field is displayed only when you select Select Ser vice in Select Pr otocol and TCP
or UDP in Prot ocol.
Select Single or Ra nge and t hen ent er a single port num ber or the range of port
num bers of t he dest inat ion. Select Any t o indicate any destinat ion port .
Policy Use t he drop-down list box t o select whether t o silent ly discard ( DROP) , deny and send
an I CMP dest inat ion- unreachable m essage t o the sender of (REJECT) or allow t he
passage of ( PERM I T) packets t hat m at ch this rule.
Direct ion Use t he drop- down list box t o select t he direction of t raffic t o which t his rule applies. The
possible options are LAN t o DEVI CE, LAN t o W AN , W AN t o LAN , and W AN t o
DEVI CE.
Apply Click Apply to save y our changes.
Back Click Back t o exit t his screen wit hout saving your changes.
Table 44 Security > Firewall > Access Cont rol > Add New ACL Rule/ Edit ( cont inued)
LABEL DESCRIPTION