The Dos Screen - ZyXEL Communications VMG1312-B Series User Manual

Chapter 15 Firewall
Table 76 Access Cont rol: Add/ Edit ( cont inued)
LABEL
I P Type
Select Prot ocol
Prot ocol
Cust om Source
Port
Cust om
Dest inat ion Port
Policy
Direct ion
Enable Rat e
Lim it
Scheduler Rules Select a schedule rule for t his ACL rule form t he drop- down list box. You can configure a
Apply
Cancel

15.5 The DoS Screen

DoS ( Denial of Service) at t acks can flood your I nt ernet connect ion wit h invalid packet s and
connect ion request s, using so m uch bandwidt h and so m any resources t hat I nt ernet access
becom es unavailable.
Use t he D oS screen t o act ivat e prot ect ion against DoS at t acks. Click Se cur it y > Fir e w a ll > D oS
t o display t he following screen.
Figure 105 Securit y > Firewall > DoS
224
DESCRIPTION
Select w het her your I P t ype is I Pv4 or I Pv6 .
Select t he t ransport layer prot ocol t hat defines your cust om ized port from t he drop- down
list box. The specific prot ocol rule set s you add in t he Se cu r it y > Fir e w 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 Spe cific Se r vice .
This field is displayed only when you select Spe cific Pr ot ocol in Se le ct Pr ot ocol.
Choose t he I P port ( TCP/ UD P, TCP, UD P, I CM P, or I CM Pv6 ) t hat defines your cust om ized
port from t he drop- down list box.
This field is displayed only when you select Spe cific Pr ot ocol in Se le ct Pr ot ocol.
Ent er a single port num ber or t he range of port num bers of t he source.
This field is displayed only when you select Spe cific Pr ot ocol in Se le ct Pr ot ocol.
Ent er a single port num ber or t he range of port num bers of t he dest inat ion.
Use t he drop- down list box t o select whet her t o discard ( D ROP) , deny and send an I CMP
dest inat ion- unreachable m essage t o t he sender of ( REJECT) or allow t he passage of
( ACCEPT) packet s t hat m at ch t his rule.
Use t he drop- down list box t o select t he direct ion of t raffic t o which t his rule applies.
Select t his check box t o set a lim it on t he upst ream / downst ream t ransm ission rat e for t he
specified prot ocol.
Specify how m any packet s per m inut e or second t he t ransm ission rat e is.
new schedule rule by click Add N e w Ru le . This will bring you t o t he Se cu r it y > Sch e du le r
Ru le s screen.
Click Apply t o save your changes.
Click Ca n ce l t o exit t his screen wit hout saving.
VMG1312-B Series User's Guide