Does ACE send a RST packet when it reach inactivity timeout?
Hi experts
I have some questions about ace's behavier.
1st one is, Does ACE send a RST packet when it reach to inactivity timeout?
2nd, Does half-closed timeout works properly with "no normalization"?
3rd, How does ACE treat the packets there is no flows in conn table? Drop or forwarding?
Thanks
Hi Kilsoo,
1st one is, Does ACE send a RST packet when it reach to inactivity timeout?
----yes, the ACE is going to send a RST if the client or server tries to do something over a connection that was already timed out
3rd, How does ACE treat the packets there is no flows in conn table? Drop or forwarding?
drops the connection
Let me do some research for your second question
Cesar R
ANS Team
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ACE SM sending a RST prematurely
I have run into an odd situation where the ACE sends a TCP reset for the public leg of a TCP session prematurely. The setup looks something like this.
Internet-->FWSM(context)-->ACE-->rservers
client upload NAT exemption routed
For VIP
<--RST
The client reports that this seems to happen most frequently on slow connection with a fair amount of packet loss. I cannot make any such claim but it is their theory. A capture from the ACE doesn't reveal anything obvious. The ACE sends ACK with Seq-1 Ack- 51777 Win29852 at timestamp 0.641248. It then follows with a RST with Seq -1 Ack - 51777 Win29852 at timestamp 0.641405 with no apparent reason why. The last packet sent by the rserver prior to this termination had Seq - 1 Ack - 51778 Win 63480 with a timestamp of 0.615157.
I don't really have much else to go on right now. I'm still digging through show commands and show-tech in the hopes that I find something. Does anyone out there have any thoughts?
Thanks,
DaveHi David,
For these kind of issues, the best approach would be opening a TAC case to have it investigated further.
The traffic capture you got and a showtech from the ACE would be a good start, but even better if you could get a capture showing both the client and server sides of the connection and a showtech before and after the test.
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Hello Everyone,
I have ACE10 Module in my switch core 6509, my context "Proxy" was criated for balance connections to Forefront TMG Servers, this balance needs original client IP Address connections end to end in the solution.
My problem is: The clients are complaining of slowness connection to the internet, i captured the traffic in the ace capture feature and i see some RST packets and severals checksum error packets in pcap file.
The topology is:
Client -> ACE VIP VLAN 81 -> RSERVERS VLAN 80
Vlan 80 is in L2 mode(no interface vlan in the switch core 6509, route occurs through the ace appliance).
The IP address 10.96.200.6 is the gw for rservers.
system: Version A2(3.4) [build 3.0(0)A2(3.4)]
system image file: [LCP] disk0:c6ace-t1k9-mz.A2_3_4.bin
rserver host PANFPRXP301A
ip address 10.96.200.11
inservice
rserver host PANFPRXP301B
ip address 10.96.200.12
inservice
sticky ip-netmask 255.255.255.255 address source STICKY-SF-PANPROXY
replicate sticky
serverfarm SF-PAN-PROXY
interface vlan 80
ip address 10.96.200.4 255.255.255.0
alias 10.96.200.6 255.255.255.0
peer ip address 10.96.200.5 255.255.255.0
no normalization
no icmp-guard
access-group input all-access
access-group output all-access
service-policy input ACCESS
no shutdown
interface vlan 81
ip address 10.96.201.4 255.255.255.0
alias 10.96.201.6 255.255.255.0
peer ip address 10.96.201.5 255.255.255.0
no normalization
no icmp-guard
access-group input all-access
access-group output all-access
service-policy input ACCESS
service-policy input INTVLAN80
no shutdown
policy-map multi-match INTVLAN80
class VIP-SF-PANPROXY
loadbalance vip inservice
loadbalance policy SLB-SF-PANPROXY
loadbalance vip icmp-reply active primary-inservice
appl-parameter http advanced-options PARAMETER-HTTP
Logs
====================================================================
Aug 15 2012 10:24:09 : %ACE-6-302023: Teardown TCP connection 0xb9fec for vlan81
:10.93.15.69/1439 (10.93.15.69/1439) to vlan80:10.96.201.10/8080 (10.96.200.12/8
080) duration 0:01:28 bytes 13741 TCP FINs
Aug 15 2012 10:24:09 : %ACE-6-302022: Built TCP connection 0x1121b8 for vlan81:1
0.93.15.69/1443 (10.93.15.69/1443) to vlan80:10.96.201.10/8080 (10.96.200.12/808
0)
Aug 15 2012 10:24:10 : %ACE-6-302022: Built TCP connection 0xc400b for vlan81:10
.93.7.69/4863 (10.93.7.69/4863) to vlan80:10.96.201.10/8080 (10.96.200.11/8080)
Aug 15 2012 10:24:10 : %ACE-6-302022: Built TCP connection 0xc676f for vlan81:10
.93.15.29/2173 (10.93.15.29/2173) to vlan80:10.96.201.10/8080 (10.96.200.12/8080
Aug 15 2012 10:24:10 : %ACE-6-302022: Built TCP connection 0xc3621 for vlan81:10
.93.7.84/54169 (10.93.7.84/54169) to vlan80:10.96.201.10/8080 (10.96.200.11/8080
Aug 15 2012 10:24:10 : %ACE-6-302025: Teardown UDP connection 0x110764 for vlan8
0:10.96.200.11/32230 (10.96.200.11/32230) to vlan81:172.17.2.35/53 (172.17.2.35/
53) duration 0:00:11 bytes 126 Idle Timeout
Aug 15 2012 10:24:10 : %ACE-6-302023: Teardown TCP connection 0x111c70 for vlan8
1:10.93.15.69/1441 (10.93.15.69/1441) to vlan80:10.96.201.10/8080 (10.96.200.12/
8080) duration 0:00:02 bytes 1759 TCP FINs
Aug 15 2012 10:24:10 : %ACE-6-302022: Built TCP connection 0x5fc51 for vlan81:10
.93.7.69/4864 (10.93.7.69/4864) to vlan80:10.96.201.10/8080 (10.96.200.11/8080)
Aug 15 2012 10:24:11 : %ACE-6-302022: Built TCP connection 0xc5282 for vlan81:10
.93.5.157/1522 (10.93.5.157/1522) to vlan80:10.96.201.10/8080 (10.96.200.11/8080
Aug 15 2012 10:24:11 : %ACE-6-302022: Built TCP connection 0x10e7a2 for vlan81:1
0.93.15.29/2174 (10.93.15.29/2174) to vlan80:10.96.201.10/8080 (10.96.200.12/808
0)
Aug 15 2012 10:24:11 : %ACE-6-302023: Teardown TCP connection 0x102c48 for vlan8
1:10.84.34.23/1130 (10.84.34.23/1130) to vlan80:10.96.201.10/8080 (10.96.200.12/
====================================================================
If needed, i can send the pcap file for analyse.
Tks a Lot.
RafaelHi Rafael,
Are RST's coming from ACE? What if you access the server directly? If you could raise a TAC case we would do in-depth analysis of the problem.
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ACE not creating session to rserver (sending a RST)
Having a ACE-Deployed for loadbalancing web-requests which are coming from a reverse-proxy. The session persistency is based on the x-forwarded-for HTTP-header entry.
The situation works fine but in certain situations it looks like the ACE (172.16.3.200) is sending a RST shortly after an ACK in direction of the reverse-proxy (172.16.2.10).
Investigating this RST shows me that ACE is not creating a session towards to the real-server, meaning session from reverse-proxy to ACE is there but session from ACE to real-server doesn’t get created (no SYN sent from ACE).
Example:
(1) 11:20:07.677541 src:172.16.2.10 dst:172.16.3.200 proto:TCP info: 38776 > http (SYN)
(2) 11:20:07.677891 src:172.16.3.200 dst:172.16.2.10 proto:TCP info: http > 38776 (SYN, ACK)
(3) 11:20:07.677920 src:172.16.2.10 dst:172.16.3.200 proto:TCP info: 38776 > http (ACK)
(4) 11:20:07.677979 src:172.16.2.10 dst:172.16.3.200 proto:HTTP info: GET /media/global/stylesheets/class.css?v=0.20 HTTP/1.1
(5) 11:20:07.678553 src:172.16.3.200 dst:172.16.2.10 proto:TCP info: http > 38776 (ACK)
(6) 11:20:07.678553 src:172.16.3.200 dst:172.16.2.10 proto:TCP info: http > 38776 (RST, ACK)
Normally, for every session from the reverse-proxy to ACE, ACE creates a session to the real-server. In this particular trace, ACE only creates the incoming one but not the outgoing to the real-server. The real-server is alive at this time, requests just some milliseconds before and after packet four (4) are processed to the same real-server correctly.
Normalization is disabled and we’re running in routed mode.
Any idea why ACE itself doesn’t creates this new session ?I just verified "show stats http" and there is a zero (0) for max parslen errors and static parse errros, so we should be fine on the length and on the value we're expecting.
Here the relevant snippets from the configuration.
sticky http-header X-Forwarded-For STICKY_HTTP-HEADER
timeout 180
serverfarm SF_FRONTEND
class-map type http loadbalance match-all CM_STICKY_HTTP-HEADER
2 match http header X-Forwarded-For header-value ".*"
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policy-map type loadbalance first-match PM_LB_FRONTEND
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class class-default
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