Migration projects - how to avoid IP conflicts
Hi, Wonder if there is smarter/easier way to avoid IP conflicts during migrations - in the phase when production and new service should listen on the same IP. Scenario: All VIPs in 192.168.1.0/24 subnet All traffic to VIPs is coming via external router (no clients in 192.168.1.0/24 subnet) Production device IP: 192.168.1.254 Production VIP: 192.168.1.100 New device IP: 192.168.1.253 New VIP: 192.168.1.100 Traffic from any client except test station (192.168.10.100) should hit VIP at production device BIG-IP setup: Floating IP: 192.168.1.253 VIP: 192.168.1.100; ARP disabled External router setup: Route: From 192.168.10.100 to 192.168.1.100/32 gw 192.168.1.253 One important note: virtual-address object for VS has to be created in advance via tmsh. For example using tmsh load sys config from-terminal merge and similar config: ltm virtual-address 192.168.1.100 { address 192.168.1.100 arp disabled mask 255.255.255.255 traffic-group traffic-group-1 } or of course any other suitable way. Reason for that is simple - auto created virtual-address objects (created when VS is created) always has ARP enabled. After finishing testing all virtual-address objects can be updated with ARP enabled using simple bash script like below: !/bin/sh $1 contains source file with VIP to place in array $2 contains enable or disable to turn on and off ARP fro VIP if [ -z "$1" ] then bad arguments - quit echo "Syntax: vip_arp_enable-disable_from-file.sh " else mapfile -t myArray < $1 local count = 0 for vip in "${myArray[@]}" do echo "Vip is: $vip"; tmsh modify ltm virtual-address $vip arp $2; ((++count)); done echo "$count processed" fi With above script it's possible to both enable and disable ARP, file with list of virtual-addresses to be processed. Result: Traffic from any client (except sourced from 192.168.10.100) is just send to 192.168.1.100 based on MAC in ARP Reply send to 192.168.1.0/24 subnet by router. BIG-IP never responds to ARP Request for 192.168.1.100 (ARP disabled on this VIP) Traffic from sourced from 192.168.10.100 is send to 192.168.1.253 (next hop, using 192.168.1.253 MAC as target and 192.168.1.100 as target IP), then internally BIG-IP is able to route this packet to configured VS with 192.168.1.100. Tested and working, but maybe not optimal approach? What I am afraid is if ARP cache on router will not be issue - like when production traffic is routed MAC of production VIP is cached, then when test traffic is processed (to the same IP as production) this cached entry will be used - traffic will reach production instead of test VIP - never happened in my lab but it's not 100% confirmation it would not fail. Router simulated using other BIG IP with two VSs: Wildcard (Forwarding IP) accepting traffic to subnet 192.168.1.0/24 Wildcard (PerformanceL4): Source Address: 192.168.10.100/32 Destination Address/Mask: 192.168.1.0/24 All ports All protocols Address Translation and Port Translation: disabled Pool with Pool Member: 192.168.1.253 (Floating IP of other BIG-IP)
Migration projects - how to avoid IP conflicts
Hi, Wonder if there is smarter/easier way to avoid IP conflicts during migrations - in the phase when production and new service should listen on the same IP. Scenario: All VIPs in 192.168.1.0/24 subnet All traffic to VIPs is coming via external router (no clients in 192.168.1.0/24 subnet) Production device IP: 192.168.1.254 Production VIP: 192.168.1.100 New device IP: 192.168.1.253 New VIP: 192.168.1.100 Traffic from any client except test station (192.168.10.100) should hit VIP at production device BIG-IP setup: Floating IP: 192.168.1.253 VIP: 192.168.1.100; ARP disabled External router setup: Route: From 192.168.10.100 to 192.168.1.100/32 gw 192.168.1.253 One important note: virtual-address object for VS has to be created in advance via tmsh. For example using tmsh load sys config from-terminal merge and similar config: ltm virtual-address 192.168.1.100 { address 192.168.1.100 arp disabled mask 255.255.255.255 traffic-group traffic-group-1 } or of course any other suitable way. Reason for that is simple - auto created virtual-address objects (created when VS is created) always has ARP enabled. After finishing testing all virtual-address objects can be updated with ARP enabled using simple bash script like below: !/bin/sh $1 contains source file with VIP to place in array $2 contains enable or disable to turn on and off ARP fro VIP if [ -z "$1" ] then bad arguments - quit echo "Syntax: vip_arp_enable-disable_from-file.sh " else mapfile -t myArray < $1 local count = 0 for vip in "${myArray[@]}" do echo "Vip is: $vip"; tmsh modify ltm virtual-address $vip arp $2; ((++count)); done echo "$count processed" fi With above script it's possible to both enable and disable ARP, file with list of virtual-addresses to be processed. Result: Traffic from any client (except sourced from 192.168.10.100) is just send to 192.168.1.100 based on MAC in ARP Reply send to 192.168.1.0/24 subnet by router. BIG-IP never responds to ARP Request for 192.168.1.100 (ARP disabled on this VIP) Traffic from sourced from 192.168.10.100 is send to 192.168.1.253 (next hop, using 192.168.1.253 MAC as target and 192.168.1.100 as target IP), then internally BIG-IP is able to route this packet to configured VS with 192.168.1.100. Tested and working, but maybe not optimal approach? What I am afraid is if ARP cache on router will not be issue - like when production traffic is routed MAC of production VIP is cached, then when test traffic is processed (to the same IP as production) this cached entry will be used - traffic will reach production instead of test VIP - never happened in my lab but it's not 100% confirmation it would not fail. Router simulated using other BIG IP with two VSs: Wildcard (Forwarding IP) accepting traffic to subnet 192.168.1.0/24 Wildcard (PerformanceL4): Source Address: 192.168.10.100/32 Destination Address/Mask: 192.168.1.0/24 All ports All protocols Address Translation and Port Translation: disabled Pool with Pool Member: 192.168.1.253 (Floating IP of other BIG-IP)F5 APM Network Access route domain -- specific gateway for vpn clients
I have setup a virtual server listening on the wan for vpn requests on port 443. I have a specific vlan configured for vpn clients 10.12.200.0/23. I have created a new route domain, and i have added the vlan into the route domain. In the VPE i added route domain and selected the correct one after authentication and before advanced resource assign. I created self ips of 10.12.200.3%200 and 10.12.200.4%200 (floating). I am able to ping the gateway on the upstream switch 10.12.200.1. If i add a default route 0.0.0.0%200 0.0.0.0 10.12.200.1%200 i cant get to anything on the vpn. it hits the self ip 10.12.200.3 and stops. If i turn on proxyarp, i get full connectivity, but the vpn client disconnects almost immediately (usually between 1-10 seconds after connecting) with no log messages other than client request to disconnect vpn session in the windows logs and in the APM it just says session deleted due to user logout request. I deleted the default route and created an l4 forwarding server source 10.12.200.0%200/23 and destination 0.0.0.0%200/0 with source address translation turned off as well as address and port translation turned off and set the pool to the gateway 10.12.200.1%200. I bound this to the vlan as well as to the connection profile vlan. This also cannot get past 10.12.200.3. If i turn on proxy arp, same thing, it works perfectly for a few seconds and then abruptly disconnects. if i turn off proxy arp but set snat to automap, i can ping everything, but nothing works in browser, rdp, ssh, etc, they all just come back saying connection refused. I cannot figure out why this is failing to work. I have seen several articles about this, and I have set this up as others have suggested and have not been able to successfully route via a default route from that vlan once connected to vpn.