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System Clock Off Continuously


One of our server's system clock seems to gradually creep away from the correct time. It has been causing us a lot of issues. After one day it becomes more than one hour off. After each minute it becomes a few seconds off.

Any ideas what could be causing this? It's uptime is ~2 months so it doesn't happen when it goes offline, it happens while it is running.

Right now we have a cronjob running ntpdate every few minutes as even with the ntpd service running it would end up off by several minutes when we would check. I have a feeling this isn't a very reliable fix though.


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- The software will input a Blackhole on the destination IP at the border/core router. The IP with the blackhole will not exist for people outside your local country (This will not affect customer if their users are in your local country and will block attackers outside your country).

- The software will block source IPs to that destionation IPs based on a specific software that we have developed and cannot tell how it works. This is the must of the system, works very well and to not affect customer/end users from accessing the server/network.

------------------------------------------------------------

The requirements for this system to work are,

- Server with two NICs. One connected to the border in promiscous mode and another to access the server (required)

- The announce of the BGP on your own border (optional). If you do not have this, the software that will input the Blackhole on the destination IP will not work.

------------------------------------------------------------

We run a Nagios monitoring system that alert us about the incoming/outcoming bandwidth, so we always know if we are fine or if we are under an attack.

We get a copy of the e-mails sent to the owners of the ASNs to keep track if the system is either working or not.

Please tell me what do you think about a software like this and if you would buy something like this.

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