topic Re: ACE FTP problem in active mode in Application Networking

ACE FTP problem in active mode

marco.becu — Wed, 06 Oct 2010 16:08:30 GMT

Hi everyone,

i have a problem with active ftp (passive ftp works fine).

here is my conf :

access-list ANY line 8 extended permit icmp any any
access-list ANY line 16 extended permit ip any any

rserver host ftp1
ip address 10.0.151.131
inservice
rserver host ftp2
ip address 10.0.151.132
inservice

serverfarm host ftp
transparent
failaction reassign
rserver ftp1
inservice
rserver ftp2
inservice

class-map match-any vip
2 match virtual-address X.X.X.X tcp eq ftp

policy-map multi-match LBPOL
class vip
    loadbalance vip inservice
    loadbalance policy lbpol
    loadbalance vip icmp-reply active
    inspect ftp

interface vlan 1000
description public-side
ip address Y.Y.Y.Y M.M.M.M
no normalization
no icmp-guard
access-group input ANY
service-policy input REMOTE_MGMT_ALLOW_POLICY
service-policy input LBPOL
no shutdown
interface vlan 100
description private-side
ip address 10.0.99.160 255.255.0.0
service-policy input REMOTE_MGMT_ALLOW_POLICY
no shutdown

on both hosts, i added X.X.X.X vip and the good rule/route with iproute2.

as i said at the beginning, passive ftp is ok. active is not.

while in active mode, i can connect to the ftp but any list/put/get fails.

any idea ?

Re: ACE FTP problem in active mode

Ivan Kovacevic — Wed, 06 Oct 2010 22:52:28 GMT

One thing I don't understand here is why do you have

serverfarm host ftp
transparent

With this in place the ACE will not rewrite the destination IP and the server will receive a packet destined to the VIP. This is not very common, but it can work. The rest of your config seems to be fine, except the missing lbpol policy.

Which sw version are you running?

Re: ACE FTP problem in active mode

marco.becu — Thu, 07 Oct 2010 09:39:31 GMT

tx for answering.

transparent is to prevent my system to work with NAT.

policy-map multi-match LBPOL
class vip
    loadbalance vip inservice
    loadbalance policy lbpol
    loadbalance vip icmp-reply active
    inspect ftp strict

system: Version A2(3.2) [build 3.0(0)A2(3.2)]

Re: ACE FTP problem in active mode

Ivan Kovacevic — Fri, 08 Oct 2010 08:46:41 GMT

So your both servers are expecting traffic with destination IP X.X.X.X? That is what the transparent command will do.

And the part that is missing begine with the line

policy-map type loadbalance first-match lbpol

Re: ACE FTP problem in active mode

marco.becu — Fri, 08 Oct 2010 13:40:18 GMT

sorry, you are right :

policy-map type loadbalance first-match lbpol
class class-default
serverfarm ftp

Re: ACE FTP problem in active mode

marco.becu — Fri, 08 Oct 2010 13:46:31 GMT

So your both servers are expecting traffic with destination IP X.X.X.X? That is what the transparent command will do.

=> yes.

Re: ACE FTP problem in active mode

marco.becu — Fri, 08 Oct 2010 15:11:33 GMT

got it

interface vlan 100
description private-side
ip address 10.0.99.160 255.255.0.0

+ mac-sticky enable
service-policy input REMOTE_MGMT_ALLOW_POLICY
no shutdown

anyway tx Ivan