You are probably here becasue you have asked the same question as I did before purchasing SecureCRT: Is it worth me forking out $100 for a terminal emulator software?
This is probably one of the question every Network/Systems Engineer asks when it comes to buying a terminal emulator, or stick with freeware like Putty/TeraTerm etc on Windows, iTerm2 on Mac and Terminal on Linux.
There is a great post covered by Greg Ferro here, where he iterates that is it not good value for money. I do agree with him 100% where you could get such application on Mac App Store for around $25. However, when it comes to evaluating a software or any matter, one needs to consider the individual requirement before committing themselves financially to the purchase.
There are a number of questions I have asked myself before going ahead with the purchase…
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Like IPv4 Address space depletion, the 2-Byte (16 bit) BGP AS number is also running out. As per RFC4893 (BGP Support for Four-octet AS Number Space) 4-Byte Autonomous Systems (AS) numbers have been issued by the Regional Internet Registry (RIR).
2-Byte (16 Bit) Autonomous System Numbers
We have a total of 216 = 65536 Possible AS Numbers
Private AS Numbers: 64512 – 65534
Reserved AS Numbers: 59392 – 64511, 65535
4-Byte (16 Bit) Autonomous System Numbers
We have a total of 232 = 4,294,967,296 Possible AS Numbers
Any numbers ranging from 65536 to 4294967295 are considered 32Bit AS Numbers.
This is the IETF preferred notation of AS Numbers, where a 2-Byte AS Number such as 65535 is represented in the form of text in both command and CLI. Where a 4-Byte As number such as 65546 will be represented in the form of “65546″
As mentioned above, the ASDOT notation for the 2-Byte AS Numbers are represented in decimal format.
4-Byte AS Numbers is represented in the following format.
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In this case, I will be upgrading an SRX210H. This step is rather straight forward and If you require further clarification, please refer to the appropriate guide from Juniper Network’s Website.
First of all, Copy the JunOS Software into a USB FAT32 Formatted drive.
Make sure you have checked the integrity of the file by runnning md5sum, and compare it with the one listed on Juniper Network’s Website.
nish@WS /media/nish/JunOS $ md5sum junos-srxsme-11.4R9.4-domestic.tgz
nish@WS /media/nish/JunOS $
Go into the Shell prompt by issuing the command
nish@iNET> start shell if you are not already in there
Check the devices to see before plugging in the USB Drive containing JunOS.
% ls /dev/da*
/dev/da0 /dev/da0s1c /dev/da0s2c /dev/da0s3e /dev/da0s4a
/dev/da0s1 /dev/da0s2 /dev/da0s3 /dev/da0s3f /dev/da0s4c
/dev/da0s1a /dev/da0s2a /dev/da0s3c /dev/da0s4
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There are various reasons the Alarm light might come on. First to check, why you are seeing the alarm.
nish@iNET# run show system alarms
1 alarms currently active
Alarm time Class Description
2013-11-02 01:09:17 GMT Minor Autorecovery information needs to be saved
In the above case, it is because Autorecovery information is not saved.
This is accomplished by doing the following command
nish@iNET> request system autorecovery state save
Saving config recovery information
Saving license recovery information
Saving BSD label recovery information
This is the address which the clients should transmit for router solicitation.
You can see an example of JunOS DCHP Option 32 address configuration below.
set system services dhcp pool 192.168.1.0/24 option 32 ip-address 192.168.1.33
Android Push / WhatsApp Messages are getting delayed with connected to Wi-Fi Router. Messages get delivered when the phone screen is turned on.
I have managed to reproduce the problem and it turned out to be a Wi-Fi chip issue on the device(s) itself.
This is because the Phone in question (Nexus 4) stops responding to ARP request when the phone is on Sleep mode. This is due to Qualcomm Prima WLAN issue which affects all phones with this specific chip…
Only way to currently fix it is to add a Static ARP entry onto the Router. Given that it is supported on the router itself. Alternatively you can use Android Notification Fixer from the Play Store but for that to work, the phone needs to be rooted.
Please make sure you have Static IP / DHCP entry configured to the given IP(s), before adding the Static ARP entry
arp 192.168.1.30 20cf.303a.f1c9 arpa
set arp 192.168.1.30 mac 20cf.303a.f1c9 publish
DD-WRT / Linux
arp -i br0 -s 192.168.1.30 20cf.303a.f1c9