Forum Discussion

Nimbostratus

Nov 29, 2008

F5 Link Controller (for VPN & soource base routing)

Hi,

I have a requirement to configure iRule for a BiGIP link controller...kindly help as I am new to iRule world.

The setup is like this... I have 2 Routers connected to Internet links, after Router I have BigIP LC (link controller) which connects to 2 inside firewalls (F1--ASA)& (F2--PIX)then L3 switch.

The F1 has configured with static NAT & site to site VPN configuration.

The F2 is connected to a L3 switch which has VLANs & subnets configured i.e 10.100.42.0, 10.100.43.0, 10.100.44.0 gw f2.

The requirement is as mentioned below:

1) for F1....internet users connected to F1 should be able to browser Internet & should connect to other site via VPN.

2) F2...The users connected vis F2 should be able to browse outside with specific ISP link with specific inside source subnet...for example, (F2 has no NAT configured)SNAT will be in F5.

source subnet 10.100.42.0----Link-1.

Source subnet 10.100.43.0----link-1.

Source subnet 10.100.44.0----link-2.

Please help me to configure to work VPN

form Firewall-1 (f1)on link controller with ISP1 only...2nd source based routing for firewall-2 (f2).

Please contact me in case of any information needed.

Thanks & Regards,

Arshad Khan

email: arshad@transition-asia.com

Phone: +91 9818185662

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node or pool to change the destination port?","id":"message:256330","entityType":"FORUM_TOPIC","eventPath":"category:Forums/community:zihoc95639board:TechnicalForum/message:256330","revisionNum":2,"repliesCount":6,"author":{"__ref":"User:user:29768"},"depth":0,"hasGivenKudo":false,"board":{"__ref":"Forum:board:TechnicalForum"},"conversation":{"__ref":"Conversation:conversation:256330"},"readOnly":false,"editFrozen":false,"showMoveIndicator":false,"moderationData":{"__ref":"ModerationData:moderation_data:256330"},"body":"I was trying to adapt the Codeshare example to support HTTP and HTTPS requests on the same VIP (Click here) using a single pool of servers defined on port 0. To do this, I'm attempting to change the port which is used on the server side, after the pool member is selected, but before the serverside connection is established.

I have a few questions:

1. Does the 'pool $pool_name member $ip $port' command require that the specified IP:port is a member of the pool? I don't get any errors when the IP:port isn't but it also doesn't seem to change the destination IP and port. If the IP:port does need to be defined in the pool, why isn't there a runtime error?

2. Is the main technical difference between using the pool and node command that stats would be counted only when using the pool command (and possibly that the IP:port doesn't have to be pre-defined when using the node command)?

3. How does LTM handle destination IP:port selection when using the pool or node command? If you specify a new destination using pool/node before LB_SELECTED, does LTM use that, or will it use load balancing/persistence based on the LB algorithm and/or the persistence profile(s) and/or the default pool on the VIP? Should you be able to specify a new destination IP/port with pool or node in the LB_SELECTED event?

I thought that using node/pool in events before LB_SELECTED would get overridden by LTM in the LB_SELECTED event, but that doesn't seem to be the case. I would have assumed that you'd need to use node or pool in LB_SELECTED to override the default destination selection.

4. In the example below, it looks like the final IP:port selected is 192.168.0.20:2. I thought it would have been 192.168.0.20:8080 as 'node 192.168.0.20 8080' is the last command used to specify the destination. Can you elaborate on what the logic is that results in port 2 being used?

Here is a rule I was using to test on 9.4.4 using a standard HTTP VIP with a single pool member, 192.168.0.20:80.

 \n virtual generic_http_vs { \n    destination 192.168.0.10:http \n    snat automap \n    ip protocol tcp \n    profile http tcp \n    pool test_http_pool \n    rule change_pool_port_rule \n } \n

 \n when CLIENT_ACCEPTED priority 250 { \n    log local0. \"[IP::client_addr]:[TCP::client_port]: new request to [IP::local_addr]:[TCP::local_port] with pool [LB::server pool]\" \n  \n    set default_pool [LB::server pool] \n    set a_member \"192.168.0.20\" \n } \n when CLIENT_ACCEPTED { \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: original: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: using 'pool [LB::server pool] member $a_member 1'\" \n    pool [LB::server pool] member $a_member 1 \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: using 'node 192.168.0.20 2'\" \n    node 192.168.0.20 2 \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: using 'pool $default_pool member $a_member 3'\" \n    pool $default_pool member $a_member 3 \n     \n    log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n } \n when LB_SELECTED { \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: original: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: using 'pool $default_pool member $a_member 4'\" \n    pool $default_pool member $a_member 4 \n     \n    log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: using 'node 192.168.0.20 8080'\" \n    node 192.168.0.20 8080 \n  \n    log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n } \n when SERVER_CONNECTED { \n    log local0. \"[IP::client_addr]:[TCP::client_port]: connected to [IP::remote_addr]:[TCP::remote_port]\" \n } \n when CLIENT_CLOSED { \n    log local0. \"[IP::client_addr]:[TCP::client_port]: connected to [IP::server_addr]:[TCP::server_port]\" \n } \n

=====================

9.4.4 log output:

Rule change_pool_port_rule : 192.168.99.65:3697: new request to 192.168.101.40:80 with pool test_http_pool

Rule change_pool_port_rule : 192.168.99.65:3697: original: [LB::server]: test_http_pool, [LB::server pool]: test_http_pool, [LB::server addr]:

Rule change_pool_port_rule : 192.168.99.65:3697: using 'pool test_http_pool member 192.168.0.20 1'

Rule change_pool_port_rule : 192.168.99.65:3697: updated: [LB::server]: test_http_pool, [LB::server pool]: test_http_pool, [LB::server addr]:

Rule change_pool_port_rule : 192.168.99.65:3697: using 'node 192.168.0.20 2'

Rule change_pool_port_rule : 192.168.99.65:3697: updated: [LB::server]: 192.168.0.20 2, [LB::server pool]: , [LB::server addr]: 192.168.0.20

Rule change_pool_port_rule : 192.168.99.65:3697: using 'pool test_http_pool member 192.168.0.20 3'

Rule change_pool_port_rule : 192.168.99.65:3697: updated: [LB::server]: 192.168.0.20 2, [LB::server pool]: , [LB::server addr]: 192.168.0.20

Rule change_pool_port_rule : 192.168.99.65:3697: original: [LB::server]: 192.168.0.20 2, [LB::server pool]: , [LB::server addr]: 192.168.0.20

Rule change_pool_port_rule : 192.168.99.65:3697: using 'pool test_http_pool member 192.168.0.20 4'

Rule change_pool_port_rule : 192.168.99.65:3697: updated: [LB::server]: 192.168.0.20 2, [LB::server pool]: , [LB::server addr]: 192.168.0.20

Rule change_pool_port_rule : 192.168.99.65:3697: using 'node 192.168.0.20 8080'

Rule change_pool_port_rule : 192.168.99.65:3697: updated: [LB::server]: 192.168.0.20 8080, [LB::server pool]: , [LB::server addr]: 192.168.0.20

Rule change_pool_port_rule : 192.168.99.65:3697: connected to 192.168.0.20:2

Thanks,

Aaron","body@stringLength":"7131","rawBody":"I was trying to adapt the Codeshare example to support HTTP and HTTPS requests on the same VIP (Click here) using a single pool of servers defined on port 0. To do this, I'm attempting to change the port which is used on the server side, after the pool member is selected, but before the serverside connection is established.

I have a few questions:

Here is a rule I was using to test on 9.4.4 using a standard HTTP VIP with a single pool member, 192.168.0.20:80.

\n virtual generic_http_vs { \n destination 192.168.0.10:http \n snat automap \n ip protocol tcp \n profile http tcp \n pool test_http_pool \n rule change_pool_port_rule \n } \n

\n when CLIENT_ACCEPTED priority 250 { \n log local0. \"[IP::client_addr]:[TCP::client_port]: new request to [IP::local_addr]:[TCP::local_port] with pool [LB::server pool]\" \n \n set default_pool [LB::server pool] \n set a_member \"192.168.0.20\" \n } \n when CLIENT_ACCEPTED { \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: original: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: using 'pool [LB::server pool] member $a_member 1'\" \n pool [LB::server pool] member $a_member 1 \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: using 'node 192.168.0.20 2'\" \n node 192.168.0.20 2 \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: using 'pool $default_pool member $a_member 3'\" \n pool $default_pool member $a_member 3 \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n } \n when LB_SELECTED { \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: original: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: using 'pool $default_pool member $a_member 4'\" \n pool $default_pool member $a_member 4 \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: using 'node 192.168.0.20 8080'\" \n node 192.168.0.20 8080 \n \n log local0. \"[IP::client_addr]:[TCP::client_port]: updated: \\[LB::server\\]: [LB::server], \\[LB::server pool\\]: [LB::server pool], \\[LB::server addr\\]: [LB::server addr]\" \n } \n when SERVER_CONNECTED { \n log local0. \"[IP::client_addr]:[TCP::client_port]: connected to [IP::remote_addr]:[TCP::remote_port]\" \n } \n when CLIENT_CLOSED { \n log local0. \"[IP::client_addr]:[TCP::client_port]: connected to [IP::server_addr]:[TCP::server_port]\" \n } \n