Questions tagged [failover]

For questions about failover in a network aspect. For instance, if you have a stack of switches and you have problems with master/slave failover or a Firewall setup with multiple hot standby's where it doesn't failover correctly. Failover can also be used in relation to a network design.

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ASA - Redundancy ISP in Multiple contexts

At the moment I am interested in the fault tolerance of the route to providers in Cisco ASA in multiple contexts. As I know, in one context you cannot track the route and change it, but the task is to ...
7 votes
7 answers
3k views

Redundant IP link aggregation for failover operation without route failure detection

I am looking for a technology to achieve TCP connection fault tolerance with the help of two links between hosts and without time delays for route failure detection. Something like this: ...
1 vote
0 answers
416 views

ASA cluster with named interface running PPPoE

I am trying to configure an A/S firewall cluster, and I have the interface configured as a PPPoE client. When I try to configure the clustering on ASDM, I get a message saying that high availability ...
0 votes
2 answers
180 views

Failover with sticky MAC address on network switch

Introduction: I am configuring a server to have two ethernet ports (one as primary, the other is redundant) connected to two different switches. In the switches, I enabled the sticky MAC address and ...
2 votes
2 answers
112 views

Data Center Warm Disaster Recovery

We are planning to create a backup data center for warm disaster recovery. Critical services will be replicated on application level to the new data center, all other services will be backuped daily. ...
1 vote
0 answers
205 views

Using PBR or similar for an IP SLA for a C1111-8P-TLELA with a dynamic Cellular WAN IP

I am trying to get 4G Failover working on a Cisco C1111-8P-LTELA router. I have a known working solution that I usually use with IP SLA, and a local PBR route-map that forces traffic out of the ...
4 votes
2 answers
275 views

How do you account for unreliable ISPs?

I maintain internet for a small business in a developing country, and I am forever struggling with unreliable service from our ISPs. Our current setup uses a Peplink Balance 580 for load balancing, ...
0 votes
1 answer
394 views

AWS direct connect with Cisco ASA redendency

We have following scenario currently and BLUE link is active and running, now i am going to get second link for redendency which is right side of diagram. As you can see currently i have VLAN 9 (...
1 vote
1 answer
354 views

Who should reset TCP connection after VIP has moved onto another host? [closed]

Imagine such a situation - TCP connection(NFS4 or database) between client(Linux) and virtual IP hosted on a server(Linux). Server fails and VIP is taken over by another server(using ARP). The client ...
0 votes
2 answers
485 views

Link failure detection between 2 routers

When 2 routers are linked directly together with eBGP between them, how is a link failure detected ? With the BGP timers ? Or faster with some sort of L1 tool? For instance, assume we have the ...
1 vote
0 answers
483 views

Cisco ASA 5585-x Failover Virtual MAC address

I have configured Cisco ASA 5585-x with Active/Standby mode, cisco best practice saying you should use Virtual MAC address on interface to avoid traffic disruption when you do failover. now question ...
4 votes
1 answer
2k views

2-stacked switches with 2 uplinks to each ASA

My current single uplink from 2-stacked switches to ASA is not enough to cater the link utilization (upload traffic from the 2-stacked switches to ASA). So, I have thought of using 2 uplinks. If I use ...
0 votes
2 answers
229 views

Best way to make a network failsafe?

I have a Debian based machine with 2 completely different network interfaces from 2 different ISPs acting as a backup for my server connection. These have two different IPs (Let's say IP1 and ...
0 votes
0 answers
111 views

pfSense: Bundling carp VIPs

When configuring Carp for pfSense as recommended by their guide, this issue appears: when pulling out the WAN cable (simulating, say, a cable failure, switch port failure, or network card failure), ...
1 vote
1 answer
198 views

eBGP failover without packet drops

I have core1 and core2 router peer with same ISP but distinct hardware and they are sending us default route. currently all in/out traffic going over to core1 and core2 is idle (standby), I have iBGP ...
0 votes
1 answer
244 views

Is it possible management IP address of ASA don't move to the new active ASA when failover happen?

I created a failover configuration on two ASA5545s. I set up, for example, 10.10.10.1 on the management interface of the primary ASA and 10.10.10.2 on the secondary ASA. I know when a failoever happen,...
1 vote
1 answer
73 views

ISP Failover On A Converged Network

We have our fiber provider as our primary ISP. We have Comcast as our secondary ISP and our VoIP provider. We can setup the failover between the two ISPs. We also have 19 VoIP phones that are on a ...
1 vote
2 answers
5k views

HSRP change priority didn't failover

I have HSRP running on two L3 switch and i change priority to higher but it didn't failover, why? SW1 interface Vlan30 description Internal_PrivateIP ip address 10.5.0.2 255.255.248.0 no ip ...
2 votes
1 answer
1k views

Cisco ASA failover monitor-interface policy

I have Cisco ASA 5585 and it has 10G interface in port channel where i configured multiple vlan sub-interface, is it worth to monitor every single sub-interface for failover policy or just monitor ...
2 votes
1 answer
2k views

NAT and two internet providers, how to configure failover

Will you please help me to setup ISP2 as a failover internet provider. Configuration as follows: ip source-route ! ip cef ! no ip domain lookup no ipv6 cef ! multilink bundle-name authenticated ! ...
2 votes
1 answer
269 views

Bonding and switching between 2 different Links/WANs/Interfaces

Before I ask anything, I'd like to say that I pretty much searched a lot (to what I know of from keywords and terms such as "bonding" "wans" "links" "failover" "aggregate") and I couldn't find any up ...
2 votes
2 answers
1k views

How to know if ISP network have multiple routes

When it is time to choose an ISP in a remote area, I hope that the chosen ISP is having an acceptable redundancy in his network. Is there any way to verify all different route an ISP is having in his ...
2 votes
1 answer
2k views

Virtual IP failover issue with vmware exsi ip based hashing

We are deploying HA database cluster on exsi which based on virtual IP concept for failover. if One node fail reserved VIP will be assigned to another node we have two exsi nodes and two virtual ...
1 vote
0 answers
456 views

Cisco ASA: Windows DHCP doesn't bind IP address after failover change active [closed]

Equipment and soft: Two Cisco ASA 5540, ASA ver. 9.1(7)32, active/standby failover DHCP server: Windows server 2016 Anyconnect VPN clients get IP addresses from DHCP servers. Everything works ...
2 votes
1 answer
199 views

one uplink, two routers for redundancy

Let's say i have two linux boxes, RouterA and RouterB, both with two NICs (eth0 and eth1). RouterA/eth0 is connected to an internet uplink. RouterA/eth1 and RouterB/eth1 are directly connected. What ...
1 vote
1 answer
329 views

Clustered Juniper devices using public DoD IP addresses for communication?

Ok, so I have to admit I am not an expert in how Juniper networked devices work, so this entire issue might be why I am having issues understanding something I am seeing on a pair of clustered SRX210H'...
1 vote
1 answer
471 views

Handling multiple redundant Metro Ethernet circuits in one location

We have recently signed up for Metro Ethernet for our main campus and 8 branches. It's a "mesh" with the carrier providing a virtual layer-2 switch in the cloud. I have a Cisco router at each site ...
2 votes
1 answer
3k views

Is it possible to implement IPSec with failover between one pfSense firewall and Amazon VPC (no BGP)

I'm trying to create a VPN connexion between my firewall (a pfsense 2.0.1) and my Amazon Virtual Private Cloud (VPC). Amazon provides two peers endpoints to mount two IPsec tunnels on the same VPC. ...
3 votes
1 answer
119 views

WAN failover when links stay up/up

If I have 2 possible outbound paths, 1 primary, 1 secondary, and I obviously need the secondary to come up if the primary fails. The problem I am foreseeing though, if the RF signal fails, the links ...
1 vote
1 answer
2k views

Preempt in ASA a/s fail over

As there is no option for preempt in ASA active/standby configuration, does anyone have a suggestion for a workaround to confirm that primary ASA will always be active when it is up?
1 vote
1 answer
2k views

How to achive switch redundancy between ASA Cluster Control Link

I have two ASA 5525-X in cluster. Between them, for Cluster Control Link, I have Switch. When this switch fails, both CCL fail and both ASAs shut down cluster mode. (data interfaces are shut down). ...
3 votes
1 answer
953 views

How switch divert traffic to standby ASA when link to active ASA is down?

Active ASA and standby ASA communicates through failover link. If active ASA detects its interface to switch is down, then it tells the standby ASA and the standby ASA becomes active. How does the ...
8 votes
2 answers
146 views

Will STP lose data whilst switching from a failed link?

In a network with a dual-redundant link between two switches, will any data be lost during the switchover from an active link to the blocked link when the active link fails?
1 vote
1 answer
66 views

Catalyst InterVLAN Routing w/ Failover ASAs

I currently have interVLAN routing configured on my Catalyst 3750. My gateway of last resort is my ASA firewall. The switch reaches the firewall through a layer 3 port. The port is configured as ...
1 vote
0 answers
182 views

How to keep the VRRP failover mechanism?

referring to the diagram below, we have 2 VLAN's for voice, primary route for VLAN1 (red) is the left side, and VLAN2 (green) is the right. As it stands we have a nice easy setup, where VRRP kicks ...
0 votes
1 answer
137 views

Setting up Hardware for HA

After designing this I went in to start configuring equipment and quickly realized I was missing alot of information/understanding. So the switches (A) between the modem and routers, do they need to ...
1 vote
1 answer
164 views

Network routing/WAN failover

Hi any one recommend me WAN Fail-over in Cisco 2811 router in virtual interfaces I already try this configuration. but its not working ip route 0.0.0.0 0.0.0.0 192.168.86.1 ip route 0.0.0.0 0.0.0....
2 votes
2 answers
3k views

Cisco failover interface in waiting

I have following scenario, where i am getting 1G copper Cat6 cable from ISP and directly terminated on my Cisco ASA firewall on Gi0/8 interface and i have configured failover now my in failover output ...
2 votes
1 answer
1k views

Dell SonicWALL - TZ series Dual Wan

Can you use dual-WAN with Active/Passive failover on any of the TZ SonicWALL models?
3 votes
1 answer
4k views

Active/Standby Cisco ASA failover without Sync

I have a pair of Cisco ASA 5585 firewalls in my network. I need to make some network changes on my network however we can have very little to no impact/downtime. I want to be able to make changes on ...
4 votes
2 answers
3k views

High availability LAN segment with Cisco ISR4451X and 2 x Netgear GS724 - Port-channel vs. BDI vs. BVI?

I have a customer that is getting a new 1Gbps ISP connection and wants his servers connected across two switches for redundancy and protection from: failure of a router port failure of a network ...
4 votes
2 answers
2k views

Multiple ISPs failover configuration

I'm going to be more explicit about this and hope you'll get me through I have two ISPs connected each one to a cisco ASA 5510.the two ASA are connected to a cisco switch 3650 that connects my LAN. I ...
2 votes
2 answers
1k views

Lowest Possible Failover Latency

Let’s say I have two networking devices (either L2 switches, L3 switches, or routers), and the two devices have two ethernet connections between them: port 1 to port 1, and port 2 to port 2. If one of ...
2 votes
2 answers
340 views

Failover with two ISPs, one with public and one with private addresses

I have the following setup: a small office network behind a Cisco 2900 series router. The network consists of about 20 devices - PCs, printers and switches. I have two ISPs that I want to configure ...
0 votes
1 answer
4k views

link-monitoring in fortigate

]3i am trying for a failover between two ISP interfaces using link-monitor in fortigate. both ISP links are vlan interface ( ie, not physical). and with my primary ISP, i have eBGP. i need to monitor ...
2 votes
1 answer
978 views

Multiple Wan Nat with IP SLA

I am trying to setup IP SLA for my WAN interface and want the NAT to be setup to when the link goes down the NAT will switch over. Here is the config: version 15.5 track 1 ip sla 10 reachability ...
0 votes
1 answer
379 views

MikroTik: bisschoff load balancing problem? [closed]

I'm using bisschoff load-balancing .its really good and works fine.but it has a problem. The problem is when a adsl line don't have access to internet , it don't disable automatically and vice versa. ...
2 votes
3 answers
4k views

Cisco ASA vs Router or Both

I have found a lot of articles asking the same question on other sites but seems to be a lot of back and forth with no agreement. I am new to networking working with VIRL and trying to learn Cisco ...
0 votes
2 answers
625 views

Set up Failover WAN with Double NAT (SonicWall)

I am trying to set up failover WAN on a SonicWall TZ300. My primary cable connection comes in via static IP (modem is bridged) to interface X1. My cellular backup is also a static IP to interface X2 (...
3 votes
2 answers
2k views

Cisco 3825 Router - Dual WAN Failover?

My Cisco 3825, (ISR?) is running fine now, thanks to a lot of help. We've now gotten another WAN link from a different ISP for redundancy. What I need is to know how to configure the router to be ...