ZyXEL Communications VMG1312-B Series - 15.5 The DoS Screen

Chapter 15 Firewall
VMG1312-B Series User’s Guide
224
15.5 The DoS Screen
DoS (Denial of Ser vice) att acks can flood your I nt ernet connect ion wit h invalid packets and
connection r equests, using so m uch bandwidth and so m any resources t hat I nternet access
becom es unavailable.
Use t he DoS screen to act ivat e protect ion against DoS att acks. Click Secur it y > Firew a ll > DoS
to display the following screen.
Figure 105 Security > Firewall > DoS
I P Type Select w hether your I P type is I Pv4 or I Pv6 .
Select Prot ocol Select t he t ransport layer protocol that defines your custom ized por t from the drop-down
list box. The specific protocol rule set s you add in the Secur it y > Firew a ll > Se r vice >
Add screen display in t his list.
I f you want t o configure a cust om ized prot ocol, select Specific Se r v ice .
Protocol This field is displayed only when you select Spe cific Pr otocol in Sele ct Prot ocol.
Choose t he I P port ( TCP/ UDP, TCP, UDP, I CMP, or I CM Pv6 ) that defines your custom ized
port from the drop-down list box.
Cust om Source
Por t
This field is displayed only when you select Specific Prot ocol in Select Pr ot ocol.
Ent er a single port num ber or t he range of port num bers of t he source.
Custom
Destination Port
This field is displayed only when you select Specific Prot ocol in Select Pr ot ocol.
Ent er a single port num ber or t he range of port num bers of t he dest ination.
Policy Use t he drop- down list box t o select whether t o discard ( D ROP) , deny and send an I CMP
dest inat ion-unreachable m essage to t he sender of ( REJECT) or allow t he passage of
( ACCEPT) packet s t hat m at ch t his rule.
Direct ion Use the drop- down list box to select the dir ect ion of traffic t o which t his rule applies.
Enable Rate
Lim it
Select t his check box t o set a lim it on the upst r eam / downstream t ransm ission rat e for the
specified prot ocol.
Specify how m any pack et s per m inute or second the t ransm ission rat e is.
Scheduler Rules Select a schedule rule for t his ACL rule form t he drop-down list box. You can configure a
new schedule rule by click Add N e w Rule. This w ill bring you t o the Se curity > Sche duler
Rules screen.
Apply Click Apply to save your changes.
Cancel Click Cance l to exit this screen wit hout saving.
Table 76 Access Control: Add/ Edit (cont inued)
LABEL DESCRIPTION