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之前发过一个帖子有关Telus, Shaw 的比较, 9 H5 z' x' |! K% D
家用Telus 已经封锁了不少端口。 也随时不通知下说锁就锁, 非常讨厌。# U, [ V6 R) f1 w5 c
. ^) T: y7 R* eDoes Telus block any ports?
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2 K& \# v. Z3 D# `% [" R& [2 z9 OThe only packages with no blocked ports at this time are the Server packages. 8 H+ M' f. n1 N) T- z
- e* w' I0 w" Q% bThe Blocked ports currently are:
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; S; y5 F# \- b- DTCP 21 (ftp)
$ ?9 a8 P C g, i$ X2 K- w* GCustomers running an FTP server will no longer be able to have Internet users connect to their server. Many customers computers are used as FTP servers to store illegal files.
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* g7 _: M7 z8 G) {. D* J( i5 h, CTCP 25 (smtp): r0 N/ f+ p0 t) ?0 f
Customers running a SMTP mail server will no longer be able to receive email requests. Also, Telus users will not be able to connect to non-Telus smtp servers on port 25. Prevent mail servers that operate as an open relay. Open relays are used without a customer?s knowledge to sends millions of pieces of Spam. r7 ^8 ]- n1 M' e/ L9 { X' T
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TCP 80 (www)0 V. L& T% k- K; e, v5 f
Customers running a Web server will no longer be able to have Internet users connect to their server. Common exploit on old Window IIS server and Linux boxes that are not properly patched.+ @9 _! v S; J- O' R# c- n' \
+ D* i, J( v8 P5 s! ATCP 110 (pop3)
5 e* o6 j; r$ D' sCustomers running a POP mail server will no longer be able to have Internet users connect to the server. Prevent mail servers that operate as an open relay. Open relays are used without a customer?s knowledge to sends millions of pieces of Spam.
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, q0 \5 v1 S/ w% p! z: uTCP 6667 (ircd)1 m6 c! {6 W1 o* j( X% B0 ]
Customers running a IRC server (Internet Relay Chat) will no longer be able to have Internet users connect to the server.0 L1 K; C, l* i7 d
2 c9 x3 L/ J J+ w, s: t8 ]% cTCP/UDP 135-139 (dcom and netbios) _( f$ |7 V8 z5 |, j" U8 L# |
These ports are commonly exploited by worm viruses:
! T3 o' S5 }) w& |6 \135 Windows RPC! \. V% L o" J) I" a8 @
136 PROFILE Naming System (basically unused)/ Y# j4 ~" H* ]8 |1 z
137-139 Windows NetBios0 h9 n9 I/ y2 @% V# f. k1 L
8 d! }2 ^& L7 J; {TCP/UDP 445 (ms-ds)9 l# N* H+ m% B% i
Microsoft Directory Services - Customers that allow legitimate Internet users access to their computers will loose this ability. This allows hackers to directly connect to a Windows based computer and gain total control over the OS.% p( a% z2 f' [+ i6 [8 u: U
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TCP/UDP 1433-1434 (ms-sql)9 g5 Y/ u7 ]2 V0 m3 i
Microsoft SQL server - Customer running an SQL server will no long be able to have Internet user connect to their server. There are several worm viruses that exploit holes in SQL server. |
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