I have 18 Linksys SRW224G4 switches. As far as I know, they can be managed only one by one via web-interface that works only in IE. Is there any way to automate this process? More specifically, now I need to enable portfast on all 100Mbit interfaces and apply one ACL to those ports. Can I do this in some automated way? Doing it manually on all 18 switches will be the worst nightmare I ever imagined.
I was using nmap to scan the mac addresses of my network.What I found was internet connections and rest of network services badly clogged the users were not able to connect to internet.After messing with different things some times later we noticed on one of machines I was running nmap and stopping it did the trick.
nmap -sP 192.168.1.0/20
Is what I was trying and it basically clogged the entire network. Can some one suggest what can be a remedy for same and why it actually happened?
EDIT
As some people suggested below it generates a lot of ARP traffic
1) is there a way I can measure this ARP traffic?
2) In this case since user applications could not reach internet is there some way I can detect congestion in network.Here nmap was run by me as root so I knew but for future I want to know.
Greetings, for a little bit of background the network we are dealing with is moving into it's 3rd generation of administration. That being said there are still devices/configuration's that are left over from the 1st. Documentation is slim but improving. The roadblock we are faced with is: from the viewpoint of upper management the network works, why change it? It's hard to communicate how even though something is working it can work better. I feel as though the overall health of our network is degrading and at some point we will reach a critical mass and it will all come tumbling down. So can anyone share any suggestions / personal experiences / advice to overcome this roadblock in management thinking? What are some key concepts / areas to look at when assessing a network?
I am testing squid 3.0 on a ubuntu amd64 box. I am facing a problem with the delay pool classes when I set the delay_access parameters with multiple ACLs. Have been going through the squid wiki and nothing conclusive. Perhaps someone or a squid guru can share their experience using delay pools in squid 3.x, 2.x is slightly different i think. I am putting all into one question, since all is related to this interesting feature in squid.
A simple example:
acl workday time MTWHF
acl work_time time 9:00 - 18:00
acl work_day time MTWHF 9:00 - 18:00
acl streaming_site dstdomain youtube.com hulu.com
delay_pools 2
delay_class 1 2
delay_class 2 2
delay_access 1 work_day streaming_site
delay_parameters 1 500000/500000 100000/100000
delay_access 1 deny all
delay_access 2 !work_day
delay_parameters 2 1000000/1000000 500000/500000
delay_access 2 deny all
Question 1: How do squid evaluates multiple ACLs in delay_access, is it using OR rule or AND rule. If it is using AND rule to match two or more ACLs, what do we do to achieve OR for the multiple ACLS.
Question 2: Does the parameters below give the same effect?
delay_access 1 work_day streaming_site
or
delay_access 1 work_day
delay_access 1 streaming_site
Question 3: Once a delay pool is not being used. Will that pool affect the total bandwidth. For example delay_access 1 rule that has expired after work hours at 18:01++. Why the delay pool is not reset back to not used. Or how to reset it back to empty?
Thanks in advance for sharing your experience.
References that I have checked, read and read and test....but still interested to know some other people experience with multiple ACLs.
- The official wiki : still not enough explanation about multiple ACLs
- Visolve.com : Open source consultancy firm..with some work with squid
- Squid ACLs and delay pool article
- Howtoforge article on delay pools : This has been referred to in another question in serverfault
- From it toolbox site
Not an issue for a small network, but becomes a pain when it grows. How can I track what ever happens to my network's hardware (repairs, upgrades, whatever) if I don't want to dig into loads of Excel and Access files?
UPDATE: Looks like it's called inventory or asset management