ping your gateway
ping 8.8.8.8
ISP's often have a direct connection to google from their network so its best to try ping an IP that will traverse the internet like ping a server in the UK or Australia
x.x.x.x = your netflow collector eg solarwinds etc.
flow exporter NETFLOW-EXP-TO-ORION
destination x.x.x.x
source vlan1
transport udp 2055
Setup what you want to record
flow record NETFLOW-RECORD-IN
match ipv4 tos
match ipv4 protocol
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
match interface input
match flow direction
collect interface output
collect counter bytes long
collect counter packets long
flow record NETFLOW-RECORD-OUT
match ipv4 tos
match ipv4 protocol
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
match interface output
match flow direction
collect interface input
collect counter bytes long
collect counter packets long
Setup the monitors
flow monitor NETFLOW-MON-OUT
exporter NETFLOW-EXP-TO-ORION
cache timeout inactive 10
cache timeout active 60
record NETFLOW-RECORD-OUT
flow monitor NETFLOW-MON-IN
exporter NETFLOW-EXP-TO-ORION
cache timeout inactive 10
cache timeout active 60
record NETFLOW-RECORD-IN Enable the monitors on the interfaces
Enable under the interfaces you want to collect netflow data from usually these will be uplinks, links to other sites etc
interface GigabitEthernet2/0/36
ip flow monitor NETFLOW-MON-IN input
ip flow monitor NETFLOW-MON-OUT output
Don't forget to write your config.
You might need to check firewall rules between the two hosts.
Allow a few minutes for the data to populate in the collector.
Get your list of IP's into sublime text or notepad++ so its easy to work with
You can use excel to generate the objectname[x]
Create the address objects
set address [address-name] ip-netmask [ip-address]
eg
set address malware-ip1 ip-netmask x.x.x.x
set address malware-ip2 ip-netmask y.y.y.y
Assign the objects to a group
set address-group [address-group-name] static [address-name]
eg
set address-group malware-ips static malware-ip1
set address-group malware-ips static malware-ip2
Once I have my script
Connect to the CLI of the palo and paste it in
I have found it only allows you to paste 80 lines or so
Sometimes I need to split up my pastes but it works for me haven't had time to look into it
Once you've got it all in there don't for get to commit
Now you can go back to the web interface / GUI and create a rule with the new address group which should contain all your IP's
The Firepower SSL Decryption feature allows you to block encrypted traffic without inspection or inspect encrypted that would otherwise be unable to be inspected. In order for the FTD to decrypt the traffic the FTD must resign all certificates of websites, this is achieved by a Man in the Middle (MITM) attack. An internal CA must be used to issue a certificate using the Subordinate Certificate Authority template; Firepower will then dynamically create a certificate on the fly (spoofing the real certificate) thus allowing for decryption and inspection of the website. The client computer must trust the Internal CA so as not to receive any certificate errors.
In this scenario an FTD v6.2.2 is acting as the gateway that will decrypt the traffic, all configuration will be made on the FMC v6.2.2.
Firepower Certificate
On the FMC navigate to Objects > Objects Management > PKI > Internal CAs
Click Generate CA
Fill out the information
Click Generate CSR
Copy the CSR request content
Navigate to the Certificate Authority (in this instance we are using Microsoft CA)
Click Request a certificate
Click advanced certificate request
Paste the CSR into the Saved Request box
From the Certificate Template drop-down box select Subordinate Certification Authority
Click Submit
Select Base 64 encoded and download the signed certificate (save somewhere to import later)
Return to the FMC GUI and navigate to Objects > Objects Management > PKI > Internal CAs
Edit the CA object previously created
Click Install Certificate
Click Browse and select the downloaded signed certificate
Click Save
If imported correctly the output will confirm
SSL Policy
For demonstration purposes in this example SSL Policy we will create 3 SSL rules: – Block insecure certificates (self signed, revoked and expired), Decrypt using DN and Decrypt using Application
On the FMC navigate to Policies > Access Control > SSL
Click Add a new policy
Click Add Rule
Enter a descriptive name e.g Insecure
From the Action drop down list select Block with reset
Click the Cert Status tab
Select the certificate status to block:- revoked, self signed and expired
Click Logging and enable Log at End of Connection
Click Save
Click Add Rule
Enter a descriptive name
From the Action drop down list select Decrypt – Resign
Select the certificate to use
Click the DN tab
Enter a wildcard DN for websites to decrypt
Click Logging and enable Log at End of Connection
Click Save
Click Add Rule
From the Action drop down list select Decrypt – Resign
Select the certificate to use
Click the Applications tab
Select the applications – in this instance we will block Google and Yahoo! Applications
Click Logging and enable Log at End of Connection
Click Save
Ensure the default action is Do not decrypt
Access Control Policy
The SSL Policy must be referenced in the Access Control Policy that is applied to the FTD.
Navigate to Policies > Access Control > Access Control
Select the ACP applied to the FTD
Click the Advanced tab
Edit the SSL Policy Settings
From the drop-down list select the previously created SSL Policy
Once the SSL Policy has been attached to the Access Control Policy the Policy can be deployed to the FTD.
Had an issue where web pages were slow to load.
Couldn't see any issues on the network.
Had to look on the client to see the issue present itself.
We could see source and destination server were communicating in good time but the web page was taking a long time to display.
I compared our site load time with https://tools.pingdom.com/ (or any external connection)
In chrome go into developer tools and look on the network tab for the load time
I found the site was trying to load google analytics waiting 20 seconds sometimes.
I needed to allow the following URLs on port 443 to fix the issue
ssl.google-analytics.com
www.google.com
www.google-analytics.com
un plug the switch
power it back on
hold the mode button in when you see xmodem is "available"
hold for about 3 seconds, and release, boot process should be interrupted. Its a bit different for each switch so google the model.
connect the console with minicom
set BAUD 115200
screen will freeze, close minicom
connect back like so
screen /dev/ttyUSB0 115200
copy xmodem: flash:/filename.bin
now press ctrl +a and then :
exec !! sx filename.bin
my file was located in /home/myuser
Some rommons can use TFTP which would be faster, you plug your
laptop lan -> mgmt port on sw
set static IP on laptop (10.10.10.1)
run tftpd server and drop ios in there
set IP_ADDR 10.10.10.2/255.255.255.0
ping to verify
emergency-install tftp://10.10.10.1/filename.bin
I was trying to connect two switches on different floors
lvl1 sw -> lvl2 sw
When I plugged in the fibre I could see the light was making it to the upstairs but when plugging the fibre cable into the switch on lvl2 the port was going into err-disable with the reason as link flap.
The cause of the issue was the wrong type of fibre cable was used in the fibre patch. Single mode cable was used. When my switch transceiver (10Gig-SR multimode) and fibre patches leads were OM3 multimode.
The core of single mode fibre is much narrower than multimode so they can't work together too much light (signal) is lost.
There are two fixes and both will probably cost you:
1 - re-run the fibre patch cables with multimode cable (OM3 or higher). Range is 300m so this is what is used inside most buildings. If you need a cable run longer then you have to use single mode.
2 - Buy single mode transceivers LRM and single mode patch cables. The single mode transceivers and cables are more expensive.
Had an issue where traffic was not working to a website. The connection to the site was branch office -> VPN -> HQ office -> VPN -> Webserver.
All VPN's were up and ACL rules looked good.
We took some captures saw the traffic going out and back but not arrvinng on the branch firewall. Looking at the asp drop table we saw tcp-not-syn. It was like the branch office could not see the return traffic was part of an existing TCP connection.
We telnet'd to the web site on 443 but using the web browser didn't work. The issue in the end was MTU.
The MTU on the branch site was set quite low 1340.
Had to reset my echo plus to fix another issue.
The echo plus has a built in bridge so I don't want to buy the Philips bridge.
Afterwards I couldn't add my Philips hue bulbs back, very annoying.
You need to reset the bulbs first.
1 Get the serial from the bulb.
2 Make sure its on, only reset one bulb at a time.
3 With the amazon alexa app on the phone, there is one master user. This is usually the phone/account that originally setup the echo. You need to use that smart phone.
4 Reset the bulb in the app
Start the alexa app on the smartphone
Go to devices in the bottom right
Tap the "plus" symbol in the top right
Add device
Tab "Light"
Scroll down to "Other"
Make sure the light is on
Tab "Discover devices"
This will fail, just wait for it
Now tap "Get help connecting"
Scroll down and tab "RESET PHILIPS HUE LIGHT"
Enter the serial number we took off the bulb earlier
Tap "Continue"
The echo should reset the bulb it should flash. Alexa should automatically discover it afterwards but if it doesn't try ask alexa to "discover my devices" again
Check if its on
auditpol /get /subcategory:"Network Policy Server"
If it shows "no auditing" its off
Switch it on (run CMD as admin)
auditpol /set /subcategory:"Network Policy Server" /success:enable /failure:enable
Check if its on after running command above - had an issue where it didn't switch on, not sure what the problem was I was stopping/starting the NPS server around the same not.
Common issues
Confirm the IP's of radius clients are correct double check for any typos check name and the actual IP set
Confirm the shared secret matches on the client (WIFI AP etc) and server end (NPS server) often copying from a previous one will work fine.
Stop/Start NPS server after adding new radius clients
Check the NPS logs as detailed above while trying the radius connection
Run wireshark on NPS server to confirm radius request arrives
Saw an issue with a new zone directory the traffic.
Old ZD was working fine with radius
Moved to new ZD and its not working
We found the connection profile was not matching
Old one was matching on "Wireless - IEEE 802.11"
The new traffic was showing up as "VPN" for some reason
Added VPN to the connection policies and it was working so moved on.
Find IP (this will find 999.999.999.999 but you might not care
\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b
Below I was looking for 192.168.x.x
(192.168.)\d{1,3}\.\d{1,3}
Notes:
\b allows you to perform a "whole words only" search using a regular expression in the form of \bword\b. A "word character" is a character that can be used to form words. All characters that are not "word characters" are "non-word characters".
\d look for a digit
\d{1,3} look for between 1 to 3 digits
(192.168.) look for a group "192.168."
Example 1
Look for some thing with any character "."
that is 1 or more long "{1,}"
followed by a new line (\n)
followed by any number of white space "(\s+)"
followed by IP address (simple) "(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
Patch your mgmt port and LAN port to the same lan/vlan
Give the management interface an IP address followed by the subnet mask and the gateway
configure network ipv4 manual 192.168.100.200 255.255.255.0 192.168.100.254
Add the manager (FMC)
configure manager add 192.168.100.253 123456
Now go to FMC and add the sensor (192.168.100.200)
You might need to add a route for the network on the FMC under System -> configuration -> Management interfaces
I tired to setup SSL decryption following the documentation from Cisco.
I was getting an error in the browser ERR_SSL_VERSION_INTERFERENCE
This is because the FTD tells the web server that it supports http2 which it actually doesn't so you have to disable that and use http1.1
From Cisco TAC:
Here is the command regarding disabling HTTPv2.0 on firepower: > system support ssl-client-hello-tuning extensions_remove 16,13172 Then you need to restart snort using following command on expert mode, this will cause network outage for a few seconds >expert # sudo pmtool restartbytype snort
