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Date: Wed, 17 Oct 2007 17:05:00 +0400
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Vladimir V. Kamarzin (Wed, 10 Oct 2007 12:23:14 +0600):

>  TB> =D0=90 =D0=B5=D1=81=D1=82=D1=8C =D0=B2 =D0=BF=D1=80=D0=B8=D1=80=D0=
=BE=D0=B4=D0=B5 =D1=87=D1=82=D0=BE-=D0=BD=D0=B8=D0=B1=D1=83=D0=B4=D1=8C =D0=
=B3=D0=BE=D1=82=D0=BE=D0=B2=D0=BE=D0=B5 =D0=BD=D0=B0=D0=BF=D0=BE=D0=B4=D0=
=BE=D0=B1=D0=B8=D0=B5 =D1=8D=D1=82=D0=BE=D0=B3=D0=BE:
>  TB> =D0=A4=D0=B0=D0=B9=D1=80=D0=B2=D0=BE=D0=BB=D0=BB =D0=BB=D0=BE=D0=B3=
=D0=B8=D1=80=D1=83=D0=B5=D1=82 =D0=B4=D1=80=D0=BE=D0=BF=D0=BD=D1=83=D1=82=
=D1=8B=D0=B5 =D0=BF=D0=B0=D0=BA=D0=B5=D1=82=D1=8B =D0=B8 =D0=BF=D0=BE=D1=82=
=D0=BE=D0=BC =D0=BD=D0=B0 =D0=BE=D1=81=D0=BD=D0=BE=D0=B2=D0=B0=D0=BD=D0=B8=
=D0=B8 =D1=8D=D1=82=D0=BE=D0=B3=D0=BE
>  TB> =D0=B2=D1=8B=D0=BD=D0=BE=D1=81=D0=B8=D1=82=D1=81=D1=8F =D1=80=D0=B5=
=D1=88=D0=B5=D0=BD=D0=B8=D0=B5 =D0=BE =D0=B1=D0=BB=D0=BE=D0=BA=D0=B8=D1=80=
=D0=BE=D0=B2=D0=B0=D0=BD=D0=B8=D0=B8 =D0=BD=D0=B5=D0=BA=D0=BE=D1=82=D0=BE=
=D1=80=D1=8B=D1=85 =D0=B0=D0=B4=D1=80=D0=B5=D1=81=D0=BE=D0=B2. =D0=9D=D0=B0=
=D0=BF=D1=80=D0=B8=D0=BC=D0=B5=D1=80,
>  TB> =D0=B5=D1=81=D0=BB=D0=B8 =D0=BA=D0=B0=D0=BA=D0=BE=D0=B9-=D0=BD=D0=B8=
=D0=B1=D1=83=D0=B4=D1=8C =D0=BA=D0=B8=D1=82=D0=B0=D0=B5=D1=86 =D1=83=D1=81=
=D0=B5=D1=80=D0=B4=D0=BD=D0=BE =D0=BF=D0=B5=D1=80=D0=B5=D0=B1=D0=B8=D1=80=
=D0=B0=D0=B5=D1=82 =D0=BF=D0=B0=D1=80=D0=BE=D0=BB=D0=B8 =D0=BA ssh, =D0=B8=
=D0=BB=D0=B8
>  TB> =D0=BB=D0=BE=D0=BC=D0=B8=D1=82=D1=81=D1=8F =D0=BF=D0=BE =D1=81=D0=B5=
=D1=82=D0=B8 =D0=BD=D0=B0 135 =D0=BF=D0=BE=D1=80=D1=82 (=D0=B7=D0=BD=D0=B0=
=D1=87=D0=B8=D1=82 =D1=82=D0=B0=D0=BC =D0=BD=D0=B0=D0=B2=D0=B5=D1=80=D0=BD=
=D1=8F=D0=BA=D0=B0
>  TB> =D1=82=D1=80=D0=BE=D1=8F=D0=BD=D0=B5=D1=86-=D1=81=D0=BF=D0=B0=D0=BC=
=D0=BC=D0=B5=D1=80), =D1=82=D0=BE =D0=BC=D0=BE=D0=B6=D0=BD=D0=BE =D0=B5=D0=
=B3=D0=BE =D0=B5=D1=81=D0=BB=D0=B8 =D0=BD=D0=B5 =D1=81=D0=B5=D1=82=D1=8C, =
=D1=82=D0=BE =D1=85=D0=BE=D1=82=D1=8F =D0=B1=D1=8B =D0=B0=D0=B4=D1=80=D0=B5=
=D1=81
>  TB> =D0=BE=D1=82=D1=84=D0=B8=D0=BB=D1=8C=D1=82=D1=80=D0=BE=D0=B2=D0=B0=
=D1=82=D1=8C =D0=BD=D0=B0 =D0=B4=D0=BE=D1=81=D1=82=D1=83=D0=BF =D0=BA =D1=
=81=D0=B5=D1=80=D0=B2=D0=B5=D1=80=D1=83 =D1=81=D0=BE=D0=B2=D1=81=D0=B5=D0=
=BC (=D0=B8=D0=BB=D0=B8 mirror =D0=BA=D0=B0=D0=BA=D0=BE=D0=B9 =D0=BD=D0=B0
>  TB> =D0=BD=D0=B5=D0=B3=D0=BE =D1=81=D0=B4=D0=B5=D0=BB=D0=B0=D1=82=D1=8C)=
. =D0=A7=D1=82=D0=BE-=D1=82=D0=BE =D0=BF=D0=BE=D0=B4=D0=BE=D0=B1=D0=BD=D0=
=BE=D0=B5 =D0=B5=D1=81=D1=82=D1=8C =D0=B2 =D0=B2=D0=B8=D0=BD=D0=B4=D0=BE=D0=
=B2=D0=BE=D0=B7=D0=BD=D0=BE=D0=BC =D0=BA=D0=B0=D1=81=D0=BF=D0=B5=D1=80=D0=
=B5 --
>  TB> "=D0=91=D0=BB=D0=BE=D0=BA=D0=B8=D1=80=D0=BE=D0=B2=D0=B0=D1=82=D1=8C =
=D1=81=D0=B5=D1=82=D1=8C =D0=B0=D1=82=D0=B0=D0=BA=D1=83=D1=8E=D1=89=D0=B5=
=D0=B3=D0=BE".
>=20
> =D0=9F=D1=80=D0=B8=D0=BC=D0=B5=D1=80 =D0=B1=D0=BB=D0=BE=D0=BA=D0=B8=D1=80=
=D0=BE=D0=B2=D0=BA=D0=B8 ssh =D0=BE=D1=82 asy@:
>=20
> # cat /etc/net/ifaces/top/fw/iptables/filter/INPUT
> [...]
> # ssh restriction
> -p TCP --syn --dport 22 -s xxx.xxx.xxx.0/28 -j ACCEPT
> -p TCP --syn --dport 22 -m recent --name ssh_rate_limit --set
> -p TCP --syn --dport 22 -m recent --name ssh_rate_limit --update
> --seconds 60 --hitcount 4 -j LOG
> -p TCP --syn --dport 22 -m recent --name ssh_rate_limit --update
> --seconds 60 --hitcount 4 -j DROP

=D0=90 =D0=B2 =D0=BF=D0=BE=D1=81=D0=BB=D0=B5=D0=B4=D0=BD=D0=B5=D0=BC =D1=81=
=D0=BB=D1=83=D1=87=D0=B0=D0=B5 =D0=BD=D0=B5 =D0=BB=D1=83=D1=87=D1=88=D0=B5 =
=D0=B1=D1=83=D0=B4=D0=B5=D1=82 --rcheck =D0=B2=D0=BC=D0=B5=D1=81=D1=82=D0=
=BE --update ?
=D0=98=D0=BD=D0=B0=D1=87=D0=B5 =D0=BA=D0=B0=D0=B6=D0=B4=D1=8B=D0=B9 syn =D0=
=B1=D1=83=D0=B4=D0=B5=D1=82 =D1=81=D1=87=D0=B8=D1=82=D0=B0=D1=82=D1=8C=D1=
=81=D1=8F =D0=B4=D0=B2=D0=B0=D0=B6=D0=B4=D1=8B.