Re: [cisco-voip] Unusual UCOS installation condition - sanity check please

[Ryan Huff]

Just wanted to provide follow up on this for the list;


The issue was in fact, Proxy ARP.


Thanks,


Ryan



From: Ryan Huff 
Sent: Sunday, March 20, 2016 11:55 AM
To: cisco voip
Subject: Unusual UCOS installation condition - sanity check please


Encountering the duplicate ip on eth0 installation error for UCOS. The IP is 
not actually duplicated on the segment though.


My experience with this error is that it is usually right; in the sense that 
something is not compatible with UCOS in the network. What I'm not certain of, 
is what method the installer uses to determine the duplicate condition. I 
believe the installer is using an ARP ping to determine if there is a dup 
condition. The error comes on a subscriber, right after the validation to first 
node check.


I believe the network may be using Proxy ARP (not completely sure); which to my 
knowledge, won't work with UCOS. I don't have visibility/access into the 
network but I do need to be able to articulate why the installer detects a dup 
IP (when there really isn't a dup IP). I have quadruple verified I am using the 
right first node / security password. This is happening for multiple subscriber 
nodes too (same segment), so I'm confident it is network related, not 
fat-finger related.


Here is the Scenario:

  *   CUCM 10.5.2 cluster over WAN (not sure what the WAN link is)
  *   2 sites; SITE_A and SITE_B (not sure what infrastructure gear is at each 
site)
 *   SITE_A: pub
 *   SITE_B: sub

In SITE_A, the pub install without issue. In SITE_B, right after the sub 
installer does the validation to first node check, it pops the duplicate ip 
error. I have a linux server installed on the SITE_A and SITE_B segment.


>From the SITE_A linux server, I do an ARPing to the SITE_B IP addresses and I 
>get the MAC address for the SITE_A WAN router (Cisco OID). From the SITE_B 
>linux server, I do an ARPing to the SITE_A IP addresses and I get the MAC 
>address for the SITE_B WAN router (Cisco OID).


Anyone have any thoughts into this?

Thanks,

Ryan
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Re: [cisco-voip] Unusual UCOS installation condition - sanity check please

[Ryan Huff]

Excellent thought! However, changing the device ID in the MAC address yields 
the same result; still detects a duplicate IP address.


Thanks,


Ryan


From: 秀王 <kiwi.vo...@gmail.com>
Sent: Sunday, March 20, 2016 11:05 PM
To: Ryan Huff
Cc: cisco voip
Subject: Re: [cisco-voip] Unusual UCOS installation condition - sanity check 
please

Have you tried changing the mac address of your VM? Sometimes it just happen to 
generate the same Mac Address as other VM in the network.

Regards,
Ki Wi

On Sun, Mar 20, 2016 at 11:55 PM, Ryan Huff 
<ryanh...@outlook.com<mailto:ryanh...@outlook.com>> wrote:

Encountering the duplicate ip on eth0 installation error for UCOS. The IP is 
not actually duplicated on the segment though.


My experience with this error is that it is usually right; in the sense that 
something is not compatible with UCOS in the network. What I'm not certain of, 
is what method the installer uses to determine the duplicate condition. I 
believe the installer is using an ARP ping to determine if there is a dup 
condition. The error comes on a subscriber, right after the validation to first 
node check.


I believe the network may be using Proxy ARP (not completely sure); which to my 
knowledge, won't work with UCOS. I don't have visibility/access into the 
network but I do need to be able to articulate why the installer detects a dup 
IP (when there really isn't a dup IP). I have quadruple verified I am using the 
right first node / security password. This is happening for multiple subscriber 
nodes too (same segment), so I'm confident it is network related, not 
fat-finger related.


Here is the Scenario:

  *   CUCM 10.5.2 cluster over WAN (not sure what the WAN link is)
  *   2 sites; SITE_A and SITE_B (not sure what infrastructure gear is at each 
site)
 *   SITE_A: pub
 *   SITE_B: sub

In SITE_A, the pub install without issue. In SITE_B, right after the sub 
installer does the validation to first node check, it pops the duplicate ip 
error. I have a linux server installed on the SITE_A and SITE_B segment.


>From the SITE_A linux server, I do an ARPing to the SITE_B IP addresses and I 
>get the MAC address for the SITE_A WAN router (Cisco OID). From the SITE_B 
>linux server, I do an ARPing to the SITE_A IP addresses and I get the MAC 
>address for the SITE_B WAN router (Cisco OID).


Anyone have any thoughts into this?

Thanks,

Ryan

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Re: [cisco-voip] Unusual UCOS installation condition - sanity check please

[秀王]

Have you tried changing the mac address of your VM? Sometimes it just
happen to generate the same Mac Address as other VM in the network.

Regards,
Ki Wi

On Sun, Mar 20, 2016 at 11:55 PM, Ryan Huff  wrote:

> Encountering the *duplicate ip on eth0* installation error for UCOS. The
> IP is not actually duplicated on the segment though.
>
>
> My experience with this error is that it is usually right; in the sense
> that * something* is not compatible with UCOS in the network. What I'm
> not certain of, is what method the installer uses to determine the
> duplicate condition. I believe the installer is using an ARP ping to
> determine if there is a dup condition. The error comes on a subscriber,
> right after the validation to first node check.
>
>
> I believe the network may be using Proxy ARP (not completely sure); which
> to my knowledge, won't work with UCOS. I don't have visibility/access into
> the network but I do need to be able to articulate *why* the
> installer detects a dup IP (when there really isn't a dup IP). I have
> quadruple verified I am using the right first node / security password.
> This is happening for multiple subscriber nodes too (same segment), so I'm
> confident it is network related, not fat-finger related.
>
>
> Here is the Scenario:
>
>- CUCM 10.5.2 cluster over WAN (not sure what the WAN link is)
>- 2 sites; SITE_A and SITE_B (not sure what infrastructure gear is at
>each site)
>   - SITE_A: pub
>   - SITE_B: sub
>
> In SITE_A, the pub install without issue. In SITE_B, right after the
> sub installer does the validation to first node check, it pops the *duplicate
> ip* error. I have a linux server installed on the SITE_A and SITE_B
> segment.
>
>
> From the SITE_A linux server, I do an ARPing to the SITE_B IP addresses
> and I get the MAC address for the SITE_A WAN router (Cisco OID). From the
> SITE_B linux server, I do an ARPing to the SITE_A IP addresses and I get
> the MAC address for the SITE_B WAN router (Cisco OID).
>
>
> Anyone have any thoughts into this?
>
> Thanks,
>
> Ryan
>
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>
>
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