ACE "sh conn serverfarm" does display connections
I have placed 8 rservers inservice behind my ACE. When I do "sh conn serverfarm video-download.domain.com" I see no connections, but I am tailing my apache access.logs and I see that the web servers are serving pages. Is this a bug?
Software
loader: Version 12.2[120]
system: Version 3.0(0)A1(6.2) [build 3.0(0)A1(6.2) adbuild_23:41:40-2007/10
/18_/auto/adbure-rel2/ws/REL_3_0_0_A1_6_2]
system image file: [LCP] disk0:c6ace-t1k9-mz.3.0.0_A1_6_2.bin
installed license: ACE-16G-LIC ACE-SEC-LIC-K9
I don't see a problem with this command in my lab.
If you do a 'sho conn detail' do you see your connection somewhere ?
Are you sure you are on the active ace ?
Gilles.
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The server has one Nic connected to Access switch1, and the other nic connected to Access switch2. Each access switch connects up to a pair of 6509's, which is active on Core1 on both switches.
I am guessing If the server sends on Nic 2, core1 knows it came in on the downstream trunk port to Switch2, it must reply to these packets based on the teamed mac of the layer 3 address(no idea who is arping for the destination - the ace?), and send them back out the downstream trunk port to switch1. The ace module is in transparent mode. When contacting a server on the other side of the ace, the ace drop packets that came from the second nic - and I am wondering how it "knows" that the return path is out of different downstream port. Does it share some kind of layer 2 RPF check with the 6500 ?
Please note there is no routing involved here. The destination server is just on another vlan on the same subnet, on the other side of the ace.Bryan,
As long as the server replies back to the ACE the client should only be commmunicating with the VIP address in either of your two examples.
In your first example the flow will look like this.
client > VIP after the ACE client > rserver
the reply would be
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In your second example using client nat it will look like this
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the reply would be
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The ACE by default will always nat the vip to the server ip unless you use the command "transparent" under the serverfarm. When using this command we send the packet to the MAC address of the server leaving the destination IP of the VIP. The server would need to have the VIP address configured under the loopback interface.
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Hello,
I was checking connections and noticed that I would see the initial connection, but after a short time the connection quits showing up in the counters and the “show conn” command. However the user is still up and working.
This is the command I used:
sho conn serverfarm STAGING-HTTPS detail
The output shows all the connection info from source to destination, and in the ESTABLISHED state.
However, after maybe 2~3 minutes, when I up arrow I don't see any connection info. The web page is still up. If I refresh the web page, I do see the connections come in.
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If you would play with a sniffer capture, you could answer the question yourself.
If the browser loads a flash object or a java applet, once it is loaded, you can still work on the page but there is no data transfer.
with a sniffer tool you could see the browser closing the connections.
The default TCP idle timeout on ACE is 1 hour.
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Hi all,
i have some queries regarding the "show conn" command in Cisco ACE.
Working Scenario:
VIP : 10.10.10.1
Server 1 : 10.10.20.1
Server 2 : 10.10.20.2
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When a client 30.30.30.1 initiates a connection to the VIP on 10.10.10.1, the ACE load balances it to Server 1, 10.10.20.1. Looking at the "show conn" table, it shows that Server 1 is replying back to the Client 30.30.30.1 through the ACE.
Now, my question is when the ACE returns the traffic to the Client, should the Client be seeing the source IP coming from the VIP or Server 1? My understanding is that the Client should be seeing traffic returning from the VIP. But the show conn table does not seem to suggest so.
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The client is expecting a response from the VIP otherwise there would be an asymmetrical routing problem and conns will never complete.
The fact that you're seeing 30.30.30.1 as the destination address is just that the server is able to see client's IP address on the request, when your backend servers sends the reply back to the client this response is forced to go through the ACE, when the ACE looks at the packet it matches with a previously conn created on the flow table so it "NATs" the reply so now the source of the packet is the VIP and destination is 30.30.30.1.
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Hi,
I have a question regarding the following output:
show serverfarm SFARM detail
----------connections-----------
real weight state current total failures
---+---------------------+------+------------+----------+----------+---------
rserver: REAL_1
10.0.0.1:80 8 MAXCONNS 10435 65590 130
description : -
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The sticky for primary serverfarm could cause that issue?
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KrzysztofHi Krzysztof,
Normally the current connection counter is number of ESTABLISHED + EMBRYONIC connections. So as soon as ACE forwards the SYN, the current counter is incremented and if the connection establishes, total connection counter is incremented or else failure.
Having said that, i still believe it should not show more than MAX-CONNS limit unless Max-conns is only for ESTABLISHED.
I would suggest opening a TAC case to further investigate this. There have many issues related to these counters which all were cosmetic and had no real impact on the functionality of device itself.
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Note: Please mark answers if they are helpful. -
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