Apache2 - DOS ?

Ahoj, mam problem s tim, ze mi vypadava webserver apache2. Vzdycky tak na 30s kazdych 5-10 minut. Vsiml jsem si toho za posledni 2 dny. Nasel jsem v logu takoveto a podobne vypisy:

70.52.15.47 - - [24/Apr/2007:16:01:10 +0200] "\xd1}.\"\xa7f\xb4\x90&\xb4IQ\x88\x0e\x9fla\xac\xaa\xcd0\t\xd6\xd0U\"\x05\xebG\xf6\x89\x18M\xd4\xf9" 400 403 "-" "-"
82.230.156.35 - - [24/Apr/2007:16:01:16 +0200] "\x85wJ\xd6ap\xb3\xc8\x16\xcc\xc8\xa4rm\x8a~M\x9a7Hr\xecu\xf0\xcb\x17+q\x91\x14{A\xb6$5j\x8b\xff(\xb5\xdd|\xb6\rl\xfad\xf7h\x10\xc1\x
ac5\xbab\x9f\x91fz\x04\xbf\xda\xf8/\xe8\xee\xd8\x7fs\xa9#\xb7v\xbc\x19\x11\x97\xc8\xdd\x0f\xd66O\")\xc5\xf32\x9eq\r\x84|\xbf>\xc2\xdf~\xbe\xff\xa7\xdbtj%\xe0\x19\x85\xdf\x1f\xab\xe
bf\xc8\x0f_df\x96,R\xf47\xc2\xc44\xe2\x8a\x07\xb5\x89V\x8c" 400 403 "-" "-"
213.144.182.200 - - [24/Apr/2007:16:01:30 +0200] "\x0f\x83\x8dfm\x93\x01iL8\x99\xb0j\x83O]X&6P\xa9\x10h\x14*c\xa9\x07\xba\x82W\xb2\x93a\xc5.\x1c\xcah\xeb5\x9e" 501 435 "-" "-"

Muze to mit s tim souvislost? Nejedna se o nejaky typ DOS utoku? A pokud ano, jakpak se asi nejlip branit? Jinak verze apache je 2.0.54-5sarge1

Dik za odpovedi.

Dotaz: Apache2 - DOS ?