Can't Use Grep To Filter Out Everything Except Down Hosts
Aug 1, 2011
I am working on a Perl script to be ran on our different subnets to see what hosts are down (and make the assumption that if the host is down the IP address is free to be used). This is not being ran on a Linux system, so I can't use grep to filter out everything except down hosts. I know there are modules for Nmap that would make this task easier, but my plan is to install Nmap to our network monitoring server, compile the script for Windows, and have it create the report for what addresses are down. I don't want each person running the script to have to have all the modules installed, etc. Or can you compile the script with the modules in it?
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Dec 9, 2011
How to get into the ip hosts on vista?
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Apr 14, 2013
I know that 255.255.255.255 is the broadcast address to send message to all hosts that are in LAN. what i want here is, i want to send a mail to all hosts using this address.
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Jul 7, 2011
I need a tool to find all the hosts connected on my network. I need something that will tell me the MAC and host type/name. I ran an IP Address tracker and got all the IPs in use, but that doesn't tell much beyond the IP address. Don't really need to do a full in-depth nmap port scan. My concern about using nmap is it can bog down a router...Although I can't say for sure if there are ways to scale the scan back in nmap so it won't cause any issues?
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Mar 4, 2011
I have several Cisco switches connecting our network. Switch N connects to the gateway, Switches Y & Z connect to some hosts. Switch N connects to Y and Y connects to Z. Assume our gateway IP is a Class B address with a netmask of 255.255.254.0 and all the hosts attached on switches Y & Z have static IP addresses assigned to them. This gateway connects to the internet.In addition to this IP address, some of the hosts also have a second IP address assigned to the same NIC. This IP is Class A (10.0.###.###) and have a netmask of 255.255.0.0 A second gateway address is not defined.
The hosts that have 2 IP's bound to their nic, use the 10. address to communicate with each other. (Programs running on the hosts are specifically configured to use 10. address).I have several questions regarding this setup:
1) Assume Host has only 1 IP (Class B) - if the destination is on the same network, does the host system send the packet to the gateway first to find the destination on the network or does the host send a "where are u" packet to the broadcast address to find the destination?
2) Assume Host as 2 IPs (Class A & B) - if the destination is a 10. address, how does the host go about finding it?
Since there is no Gateway defined for the Class A address, does the host simply send out a packet to the broadcast address for the Class A network? or does it go to the gateway defined in the Class B network as it was defined first (i'm assuming primary connection)
3) Assume Switch N's connection to Switch Y is disabled - how will this affect communication between hosts on Switches Y & Z that have a 10. IP trying to share data with each other, using the 10. Address. If the answer is this should not affect it, what additional circumstances are required that may cause the systems with a 10. address to be unable to communicate when the connection from Switch Y to N is terminated?]
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Jun 7, 2011
We have a modified hosts file on each of the computers here at work. This way we can have multi servers, in multi locations that can all be used by everyone for email & our finance program.However, there is one user who the hosts file keeps disappearing. Over the last 2 days it has disappeared 3 times (at least).The user has ran the symantec corp antivirus (at least a couple of times). All risks found have been quarentined and deleted, ran again and nothing found. Also ran Malwarebytes, which was clean. And ran ComboFix.At this point the hosts file has been fixed after running ComboFix.
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May 23, 2012
Do you have any suggest for network scanning software?Something who can find IP address and hosts in the network?
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Jun 17, 2011
So we have a cisco asa 5505. Once a day now (random times) it will suddenly be unreachable along with the hosts connected. If I console in and ping a host from the asa, suddenly it becomes reachable from the outside world again. My job prohibits me from posting the configuration online.
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Jan 30, 2012
I'm new to this site, fully Microsoft certified but only just getting in cisco and looking to pass my CCNA later this year. Actual commands and general use on Cisco's im quite good at but general networking knowledge on networking (subnetting and network layers) I kinda suck at so will be studying a lot on this side of things[CODE]
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Feb 23, 2011
for network 192.168.7.128/26 what is the first usable host IP address in decimal? What is the last usable host IP address in decimal?
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May 17, 2011
Trying to use the "File Operations" option to import hosts into ACS. I go through the wizard and click "Finish", the pop up goes blank and just hangs there. No errors are generated.
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Nov 13, 2012
Seems like something simple, but can't find on Cisco.com. What are the max SNMP hosts allowed on an ASA 8.2 code? That would be Polls and Traps?
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Dec 4, 2012
I am trying to block access to facebook and twitter on my router, to a certain range of ips, 192.168.1.8 - 254. I have been digging around and trying stuff but all I do seems to restrict everyone access to the internet.
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Mar 22, 2013
Why it makes problems to use a default route on a BGP-router (cisco 6500 with sup720 3bxl).Only a very few amount of hosts have that kind of problem and the 50% paket loss is only between this hosts. So another host has no loss to any of the affected hosts. looks for me like there is a problem in the CEF-table.The router has a BGP-fulltable. The gateway of last resort is only set for cases like a flapping BGP-route, so that the traffic is sent to a default next hop, because sometimes he knows a better route which isnt flapping.
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Jun 1, 2011
you can subnet to meet the number of networks required, or you can subnet to meet the number of hosts required. In which circumstances would you use either one? or are they both the same? am kinda confused.Is subnetting according to the number of hosts VLSM? and subnetting according to the number of networks required is not VLSM subnetting? Also I'm on CCNA 1 chapter 6, if the other CCNA 2, 3 and 4 has chapters explaining subnetting better cos It's totally confusing me atm.Also, is my understanding correct, when a company wants a LAN made, a network designer see's how many hosts they require in each of their LANS and then chooses an appropriate address class and subnets it? and to connect the LAN to the internet he implements NAT on the router that connects to the internet, and that router translates the internal addressing scheme that was created into a public registered IP address from an ISP? Also does he just make the address up? for example if he decides to use class C, he just picks any random number in the class C range and subnets it?
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Jul 24, 2011
I have a PC upstairs, let's call it (Peter-PC), my dad has a PC downstairs (Kris-PC) and I just setup a linux home server downstairs as well called (server).Now, Peter-PC is connected through Linksys powerline adapters to the router, and server and Kris-PC are connected directly to the router as well.Peter-PC stays constantly connected to the internet, only until Kris-PC is turned on, then Peter-PC connection goes mental and begins to disconnect, reconnect, can't ping the router. As soon as Kris-PC is turned off,Peter-PC is back to normal.However, if Kris-PC and server are both on, they both operate fine. Seems like Peter-PC is the only unfortunate one.I mean the powerline adapters have been working for over 3 years now, and the Powerline light is flashing meaning they are communicating, I highly doubt it's the adapters.
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Jun 8, 2013
I am struggling to get successfull pings beween asa and inside hosts but couldn't succeed. Done packet tracer result is acl-drop
Here is the running config
Prem-ASA(config)# sh run
: Saved
:
[Code].....
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Jun 24, 2012
configuring ASA 5505 to be able to ping remote host.Setup - We have a site-to-site (192.168.1.0/24 - 192.168.2.0/24) VPN setup with client VPN access (IP Pool, 172.16.50.0/24) on 192.168.1.0 ASA 5505.Issue - Not able to ping host on 192.168.2.0 from VPN client 172.16.50.0 but able to ping 192.168.1.0 host.
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Apr 7, 2013
I have a site to site vpn connection between ASA 5510 and PIX 515 which is working fine. There is no problem for hosts on any side of the tunnel to access a cross. However the local ip (192.168.20.1) on the client interface of my PIX is not allowed to access hosts on the other side of the tunnel. [code]
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Sep 24, 2012
I'm testing upgrading an ASA from 8.2.5 to 8.4.4. During the the upgrade, it change all of my ACL host entries to objects. But I noticed that the keyword "host" is still a valid option when creating an ACL.
I'm trying to understand why this change is made during the migration.
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Oct 3, 2011
Looks like I still have an issue with LMS to recognize the IP Phones in UT as IP Phones. SNMP RO on Call Manager is enabled and is green in CM (e.g. topology) - so SNMP get is basically fine. The Phones are recognised as End Devices in UT.
As far as I understand, now if I start a Phone Aquisition, the CUCM is polled by LMS to gather additional information about the phones. So it seems there is a problem with the SNMP polling of the Call manager?
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Jun 9, 2011
DNS resolution works and I can surf the web without fail. But if I try to ping any external hosts (I can ping inside interface of ASA fine) from the LAN I get timeouts. I can ping anything from the ASA without fail.
ASA Version 8.4(1)
!
hostname fw1-nat-ann
domain-name inmd.infoblox.com
enable password anWLNen9CTFp7B/X encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
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Dec 6, 2012
I'm having an issue where internal hosts cannot access the internet but I am able to ping external hosts when I console into the router. The router is a 2800 series. [code]
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Jun 18, 2012
I am able to reach VPN clients (Anyconnect) only from hosts directly connected to the ASA's inside interface subnet. However, hosts on other internal subnets (177.1.10.0 & 177.1.11.0) are unable to connect to clients on VPN. The ASA is running ver 8.4. [code]
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Nov 21, 2012
ASA is running 8.4.
Internal interface: 172.16.1.1
External interface: 172.16.2.1
Routing to 192.168.0.0 via internal host.I've got some static NATs, e.g:
object network obj-192.168.0.1
nat (inside,outside) static obj-172.16.2.1
object network obj-192.168.0.3
nat (inside,outside) static obj-172.16.2.2
I also want in internal NAT, but only for certain external hosts, so when they connect to any of the above, their source address is changed. I've attempted the following so an external host (172.16.2.254), has it's source changed to 172.16.1.100.
nat (outside,inside) source static obj-172.16.2.254 obj-172.16.1.100
But it's source remains unchanged.What am I missing?
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Aug 30, 2011
I have two hosts behind an ASA on a private network. Both hosts are NAT'ed (each has a unique public IP). I need Host A to be able to talk to Host B through their respective external IP's.
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Sep 27, 2011
I am able to connect to my Cisco ISR 891 via VPN with the Cisco VPN Client 5.0.07.0440, but once connected I cannot access hosts on the inside. If I ping a host on the inside by name, nothing resolves. If I ping by IP, I get a reply from the public IP of the router. [code]
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Oct 31, 2012
I've been attempting to fix this issue or confirm the issue is not with the firewall and I have kind of run into a road block. This is my problem as I understand it. A client of mine has a VPN tunnel built over a point to point connection of some kind (this client is fairly new to me) and is unable to access some hosts on the remote end of the VPN tunnel from the LAN side of the firewall. The LAN IPs are NAT'd as they leave the network from the HPH-Point-to-Point interface to the remote end. Just as a point of reference, the LAN IP of 129.200.11.19 is said to be working, however the range of 129.200.20.25 - .50 is not. I've tried packet-tracer but with the NAT happening over a VPN tunnel I am not sure if I am doing it correctly.
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Aug 6, 2012
We are using Cisco Works LMS 4.0.1. Acquisition info reports last acquisition end time 19 July and Campus data collection running. Number of host entries is 68 but we have two thousands PCs. When we try to perform an acquisition action with scope all hosts and users, we receive this message;
Failed to start acquisition: Construction of XML data required for UT is in progress.Please try after some time.
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Feb 10, 2011
I'm just new with ASA. I'm just self-studying on it. I was tasked to have an ACL that will allow inside hosts to access a specific network. Is there a way on how to know all the inside hosts on the behind ASA so that I can do a "object-group network" on those inside hosts which I think it will look neat.
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Jul 13, 2011
I have recently bought two 1800 cisco routers and have tried to connect them over wan serial link, but I am having problems when trying to access resources on the other side. I am a newbie to cisco and I wonder if the problem is with the configuration or the new routers or the serial link between the sites. Below is the show-running config results I have done on both routers; I can ping the serial interfaces from both sides and remotely, but I can't ping hosts or FE from other side.
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Feb 18, 2012
The ASA5505 I am working with has this from the show version:
Licensed features for this platform:Maximum Physical Interfaces : 8VLANs : 3, DMZ Restricted Inside Hosts : 10Failover : Disabled VPN -DES : EnabledVPN-3DES-AES : Enabled VPN Peers : 10WebVPN Peers : 2Dual ISPs : Disabled VLAN Trunk Ports : 0
This platform has a Base license.
Does the Insides Hosts :10 line mean that only 10 devices can be connected to the firewall at one time? I would like to connect an AP to one of the PoE ports and have possibly more than 10 connected. Is this possible with this ASA5505?
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Feb 9, 2013
I have configured the ASA in a very similar manner to how the PIX was set up but I'm having trouble with some hosts on the inside accessing the Internet. Any inside hosts which use DHCP work fine. Any inside hosts with a static IP (and configured on the ASA with a "static" rule) cannot access the Internet. For example, in the config below the server daviker-dialler cannot access the Internet. I've spent a few days working on this now and have started from scratch several times but I'm not getting anywhere. Apologies for all the X's everywhere, didn't like to post anything sensitive on the Internet.
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