ARP issue?

[Virtovo]

I just want to confirm my thinking on this issue.  The provider I am trying to work this through with are not accepting this is the issue:

Randomly an IP drops off and cannot be pinged/connected to.

If accessing the machine via other means and sending a ping from the machine, it works fine and then the server can once more be pinged/connected to for a brief period of time.  

My thoughts are issues around arp entries and sending a ping from the machine enables access until it drops of the arp cache again.

 

[Jack]

Which provider? 

 

[Virtovo]

Which provider? 

Dacentec and they have just cleared the arp-cache.  So we'll see how it goes. 

 

[Jack]

Dacentec and they have just cleared the arp-cache.  So we'll see how it goes. 

Oh, I was going to say I had a similar issue with CC in Buffalo.

 

[Virtovo]

Oh, I was going to say I had a similar issue with CC in Buffalo.

Did you get to the bottom of it?

 

[Jack]

Did you get to the bottom of it?

Nope

 

[Virtovo]

Nope

So you didn't solve it?  Did it just affect one IP?  What did you do? 

 

[Jack]

So you didn't solve it?  Did it just affect one IP?  What did you do? 

Left Colocrossing as it was one of many issues I had with them and they didn't want to help.

 

[WebSearchingPro]

I just want to confirm my thinking on this issue.  The provider I am trying to work this through with are not accepting this is the issue:

Randomly an IP drops off and cannot be pinged/connected to.

If accessing the machine via other means and sending a ping from the machine, it works fine and then the server can once more be pinged/connected to for a brief period of time.  

My thoughts are issues around arp entries and sending a ping from the machine enables access until it drops of the arp cache again.

Is it just one IP or multiple?

 

[Virtovo]

Is it just one IP or multiple?

Only observed on a single IP and clearing the arp-cache seems to have fixed it.

 

[concerto49]

Only observed on a single IP and clearing the arp-cache seems to have fixed it.

Could be a firmware bug on the switch that requires updating.

 

[goo]

This may or may not be related but randomly some people out of around 100ish connected to my Dacentec on a specific IP will just drop at once for around a minute then reconnect. 90% of people never drop, but only a few will.

 

[Wintereise]

Instead of having it cleared, why don't you ask them what their expire-age is set to, and when this happens -- is the IP actually in the table?

sh mac-address-table interface <> / sh arp interface vlan/irb.unit, etc.