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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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 ...
Mhd Ghd's user avatar
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201 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 ...
Geekman's user avatar
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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. ...
Алдар's user avatar
1 vote
1 answer
350 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 ...
ibre5041's user avatar
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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 ...
huseyin39's user avatar
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482 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 ...
Satish's user avatar
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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 ...
roee klinger's user avatar
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109 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), ...
aphid's user avatar
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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 ...
Satish's user avatar
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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,...
masafumi_from_Japan's user avatar
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 ...
Satish's user avatar
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1 answer
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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 ! ...
PSh's user avatar
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2 votes
1 answer
267 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 ...
Viktova's user avatar
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2 answers
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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 ...
rainvillem's user avatar
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 ...
gripenfighter's user avatar
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0 answers
453 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 ...
Nadia's user avatar
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1 answer
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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 ...
ChennyStar's user avatar
1 vote
0 answers
181 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 ...
user10021657's user avatar
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 ...
null's user avatar
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1 answer
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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....
waleed jamil's user avatar
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1 answer
136 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 ...
Kevin Knapp's user avatar
0 votes
1 answer
392 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 (...
Satish's user avatar
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4 votes
2 answers
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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 ...
Mike Tubby's user avatar
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 ...
Satish's user avatar
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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 ...
Elisée's user avatar
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1 answer
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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 ...
abdul_razak's user avatar
1 vote
1 answer
65 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 ...
Josh Friedman's user avatar
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 ...
Anthony Fornito's user avatar
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2 answers
621 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 (...
MrPeanut's user avatar
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3 votes
2 answers
711 views

EIGRP failover - how do i verify it happened?

I have 2 links to a destination and EIGRP was setup. The faster link is the successor and the slower link is the feasible successor. Switch1#show ip eigrp topology 192.168.1.0 EIGRP-IPv4 Topology ...
Noob's user avatar
  • 529
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 ...
Bruce's user avatar
  • 43
2 votes
1 answer
4k views

ASA Redendent Failover and stateful link issue

We have ASA 5585-X and i create back-to-back (without intermediate switch/hub) two 1G cable between two ASA to create failover + stateful link using g0/6 and g0/7 interface. Interface config ! ...
Satish's user avatar
  • 4,379
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, ...
Josiah Nunemaker's user avatar
1 vote
1 answer
585 views

c5915 DMVPN Spoke ISP Failover- Single Hub

I have a mobile application that utilizes cellular and satcom services to form a VPN connection to our hub. In the current configuration, failover works based on the ip hello-interval eigrp 1 15, ip ...
Matthew's user avatar
  • 13
1 vote
1 answer
468 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 ...
theglossy1's user avatar
4 votes
0 answers
1k views

Dual ISP NAT Failover Not Working

I have a Cisco 1841 router with an HWIC-4ESW switchport module attached to it. Fa0/0 is connected to ISP1 and Fa0/1 to ISP2 and both are "ip nat outside", the switchports are in interface Vlan 1, ...
peter_s's user avatar
  • 131
2 votes
1 answer
2k views

IP SLA command not available, alternatives?

I have a Cisco router with two ISPs connected to it, and I wanted to configure a failover between them using an IP SLA, track for the IP SLA and two static routes (when the first route fails, the ...
peter_s's user avatar
  • 131
2 votes
2 answers
337 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 ...
peter_s's user avatar
  • 131
2 votes
1 answer
4k views

ASA5550 manual failover question

We have two ASA5550 primary & secondary and they are pretty old running from since last couple year and we never bother to touch but recently we are doing some maintenance and found we need to ...
Satish's user avatar
  • 4,379
2 votes
1 answer
88 views

Multhoming including incoming connections?

I am investingating the option of connecting our business network to 2 separate ISPs for redundancy. Since we have a couple of B2B services which need to be accessible from outside, in order to have ...
Gnudiff's user avatar
  • 209
2 votes
4 answers
3k views

Web server address with two ISPs

I am new to networking and I have the following problem. In the small company I work in we have a load balance router with two ISPs (only one ISP is connected at the moment) and to the router there is ...
peter_s's user avatar
  • 131
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 ...
albinotuba's user avatar
2 votes
1 answer
613 views

Layer 2 Failover

How can I setup a layer2 failover configuration? My Network setup: The distance between Site A and Site B is 2 km. Both sites are connected via a wireless link. As a backup line, we also have a ...
user42016's user avatar
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'...
Richie086's user avatar
  • 243
0 votes
2 answers
684 views

Cisco WAN failover without routing [closed]

I'd like to have my Cisco router failover from a primary WAN to a secondary WAN interface when the primary stops routing traffic. Neither WAN is running any routing protocol, these are residential-...
Pablo's user avatar
  • 77
1 vote
1 answer
287 views

Network failover from PTP Wirless to VPN

I have a ptp wireless network that spans 20 miles from one location to another. It works great. This is a critical network connection for us. I would like to have a vpn backup in case it should ever ...
ahackney's user avatar
  • 201
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 ...
Satish's user avatar
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2 votes
1 answer
172 views

Alternative solutions to using a dynamic DNS service to manage a failover ethernet/cellular device [closed]

We have RS232 sensors connected to a serial device server that manages both ethernet(primary)WAN and cellular(failover)WWAN connectivity. A database application requires a single IP to manage each ...
E. Donan's user avatar
1 vote
1 answer
848 views

VRRP dual ISP setup

I have a project which I'm struggling with and wondered if someone can offer some advise on the best way to achieve my goal (I'm new to Juniper). At the moment I have 2 juniper SRX240s, one connected ...
Adrian's user avatar
  • 41
3 votes
2 answers
3k views

how to setup dual ISP fail over with 2 routers

I have a project which i'm struggling with and wondered if someone can offer some advise on the best way to achieve my goal (i'm new to Juniper). At the moment I have 2 juniper srx240, one connected ...
Adrian's user avatar
  • 41