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Scenario: A Citrix Administrator configured a Citrix ADC active-passive, high availability (HA) pair. The HA pair failed over and customers were unable to access hosted websites. The administrator troubleshoots and discovers that the upstream router is NOT updating its ARP table.
What can the administrator configure to resolve this issue?
Suggested Answer: B
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31 comments · newest first
FR
Francis
10 months ago
I thought HA monitor was supposed to handle this kind of failover!
RO
Ronny
11 months ago
Route monitor could also be a solution, right?
CO
Cory
11 months ago
Wait, are we sure INC mode won't mess things up?
SA
Samira
11 months ago
Definitely agree, that should help with ARP issues.
CH
Christiane
11 months ago
I think Virtual MAC is the way to go here.
LO
Louann
12 months ago
I vaguely remember that if the router isn't updating its ARP, it could be a problem with how the MAC addresses are handled. I think Virtual MAC could be the answer, but I’m not entirely sure.
RO
Rosina
12 months ago
I’m a bit confused about the difference between HA monitor and Route monitor. I feel like one of them might help with the ARP table issue, but I can’t recall which one.
FR
Fredric
12 months ago
I think we discussed using Virtual MAC to help with failover scenarios. It might be the right choice here since it can help the router recognize the active node.
HY
Hyman
1 year ago
I remember something about ARP issues in our practice sessions, but I’m not sure if it was related to INC mode or Virtual MAC.
ET
Ettie
1 year ago
I'm leaning towards the Virtual MAC option. That should help ensure the upstream router has the correct MAC address to forward traffic to the active Citrix ADC.
PA
Pamella
1 year ago
I'm a bit confused on this one. The HA monitor or route monitor options don't seem directly relevant to the problem described. I'll have to review the concepts again.
GE
Gearldine
1 year ago
Okay, let's see. Independent Network Configuration mode could be a good solution, but I'm not totally sure how that would resolve the ARP table issue.
JA
Janella
1 year ago
Hmm, the upstream router not updating its ARP table is the key issue here. I think the Virtual MAC option might be the way to go.
AS
Asha
1 year ago
This seems like a tricky one. I'll need to think through the different options carefully.
KE
Kenia
1 year ago
Virtual MAC seems like the way to go. I mean, who doesn't love a little bit of virtual magic to solve their problems?
MY
My
1 year ago
Johnson: Sounds like a good solution. I'll give it a try.
JO
Johnson
1 year ago
Rory: It can help resolve the issue with the upstream router not updating its ARP table.
RO
Rory
1 year ago
User 2: No, I haven't. What does it do?
EL
Elliott
1 year ago
User 1: Have you tried configuring Virtual MAC?
VA
Vanda
2 years ago
Ah, the joys of troubleshooting networking issues. I bet the administrator wished they had a magic 8-ball to tell them the right answer.
CA
Carmen
1 year ago
B) Route monitor
CL
Clemencia
1 year ago
A) Independent Network Configuration (INC) mode
GA
Gabriele
2 years ago
I believe Virtual MAC could also be configured to resolve the issue by assigning a unique MAC address to the HA pair.
PO
Polly
2 years ago
I'm not sure about the correct answer, but I heard that the administrator could also try turning the router off and on again. That usually fixes everything, right?
AD
Adelle
1 year ago
D) Virtual MAC
SH
Shawn
1 year ago
C) HA monitor
SE
Selma
1 year ago
B) Route monitor
JU
Justine
1 year ago
A) Independent Network Configuration (INC) mode
KA
Kathryn
2 years ago
I agree with Cherrie, Route monitor can help resolve the issue by checking the status of the routes.
KR
Kris
2 years ago
The administrator should configure the Virtual MAC option to resolve the ARP table issue. This will ensure that the MAC address remains the same during failover, allowing the upstream router to update its ARP table accordingly.
CH
Cherrie
2 years ago
I think the administrator should configure Route monitor.