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Does anyone know where I can find some good basic subnet mask information? I need to block certain IP ranges and I don't know the first thing about what subnet mask to use. Thanks.

Thanks, routerman. By the way, how many access lists can be applied to an interface? I don't understand correctly regarding the outgoing. All outgoing traffic is currently authorized, so I would effectively need to block everything outside of my IP range. So would I first need to write my...

Let me re-state things. Hopefully someone can help me resolve this. I have a server that should only be accessed by a certain range of IP addresses. There should be no traffic to or from this computer except to this specific IP range. I don't know if this affects anything, but the server's IP...

Another question relating about the incoming traffic: I am permitting access for certain IP numbers, but don't I have to deny all other ones as well?

Great, it works. Now how would I block all outgoing traffic except for my 111.222.333.x IP class?

I'm getting an invalid input error at the first "0" in 0.0.0.255. What am I doing wrong? access-list 120 permit ip host 1.2.3.1 host 111.222.333.0 0.0.0.255

Thanks for the responses. We've now decided to permit an entire IP class 111.222.333.xxx (256 addresses). What would be the syntax for that?

I've got a pc that is used internally as a server. I would like my Cisco to block all traffic coming in from the Internet for this IP address except for traffic from four specific IP addresses. Can anyone help me with the access list entries?

I'm updating an old project where we download an html file and extract information from it. Below is the old code. What I need to do is search for a particular html string that is a unique occurence in the text, then extract from the file, for example, the next 6 characters to the right of the...

Do you have the PDF file yourself? You can e-mail it to me. I have a yahoo.com address with the name narboule. Thanks for all your help.

I did what you said, and when I typed &quot;sh log&quot;, I got the %SYS-5-CONFIG_I message and the following: %SEC-6-IPACCESSLOGP: list 130 denied tcp <IP1> (3140) -> <IPRemote> (5190), 1 packet I am interested in the PDF file you have for access-lists. Can I download it somewhere?

No, I don't receive that message, nor do I recall ever having received it. Here's what I got: ras#ter monitor ras# ras#conf t Enter configuration commands, one per line. End with CNTL/Z. ras(config)# ras(config)#^Z ras# The personal firewall on the workstation logs TCP Port 5190 when I access...

Here's my output: Syslog logging: enabled (0 messages dropped, 0 flushes, 0 overruns) Console logging: level debugging, 628 messages logged Monitor logging: disabled Trap logging: level informational, 632 message lines logged About the output list, do I understand correctly that the...

fmonteiro - Thanks, the access list works fine when assigned to the ethernet interface - I was unable to connect to AIM from the IP number used in the access list. However, I still don't see any activity when I type &quot;terminal monitor&quot; at the &quot;router#&quot; line. I did include the...

Thanks BuckWeet and fmonteiro. Here's what I need: we've got a couple of workstations that are spending a lot of time doing instant messaging and I've been asked to try to block specific ports used by these services for the workstations in question. It would be wisest to block for both incoming...

Fmonteiro - Sorry, you have to bear with me. I have no training on routers and was shown how to carry out certain tasks. Beyond that, I need things spelled out. After typing &quot;terminal monitor&quot; at the &quot;router#&quot; command, I launched the service from the workstation whose port...

fmonteiro, I also changed the tcp entry to log. I am using Telnet, however, I don't know what to do when you say to access the application.

Thanks for your replies. I installed the new filter, it shows up in the NVRAM configuration, but it doesn't block the traffic - the firewall on the computer I tested it on shows port 5190 being used to connect to AIM and I am able to use the AIM service. Here's my complete access list. Maybe...

I'm pretty new to router configuration and have blocked certain ports on my Cisco 3620 for my entire network. I now need to block a specific IP address from using port 5190 on tcp and udp. What subnet mask do I use in the filter? Thanks.