In this troubleshooting article, I will explain what traffic is expected to collect in a tcpdump capture during an ongoing attack. In this way you can compare with your own environment and understand why you see what you see.
Use cases
In this section I will show you the most common SYN Cookie configurations and how they affect to the traffic that reach BIG-IP. For each use case I add a diagram explaining the role of each party, so you can use it as a rerefence when reviewing captures.
Note that, as a rule of thumb, in tcpdump captures you will see only traffic reaching red TMM arrow in diagrams.
FastL4 + Hardware SYN Cookie
Fig15. FastL4 + HW SYN Cookie
When enabling SYN Cookie hardware offloading in FastL4 you must have into account that, regardless if FastL4 profile is configured as EST or SYN for ‘PVA TCP Offload State’ the capture will be similar to the one I paste below.
Also note that colours in captures match with the diagram above, that is, blue (on the left) for client, red (next to blue and green) for BIG-IP and green (on the right) for server.
There are three important things you can observe in above captures:
TCP options are lost in this example. This is because SYN Cookie is offloaded in hardware and for this mode currently only MSS value is trasfered from client side to server side, with some limitations. Check article dedicated to 'Hardware Vs Software' in this article series.
In BIG-IP you cannot see the first two packets of TCP 3WHS (SYN and SYN/ACK). This is because hardware is in charge of validating SYN Cookie, since tcpdump is capturing traffic in TMM you only see last ACK packet.
Also note that SYN sequence number sent by client to BIG-IP is the same than the one BIG-IP sends to Server.
FastL4 + Software SYN Cookie
Fig16. FastL4 + SW SYN Cookie
In this case, although you are using an accelerated profile (FastL4), since software is handling the TCP 3WHS this allows you to see all packets when you run a traffic capture. Blue is on the left, red in the middle, green on the right.
16:31:24.340003 IP 10.10.10.10.34527 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 5840, length 167: HTTP: GET / HTTP/1.1
As it happened in the previous example, BIG-IP does not ACK the HTTP request (PSH) sent by client because a FastL4 profile is being used, what it means that BIG-IP will act as a TCP transparent proxy between server and client. In other words, once correct TCP handshake has done BIG-IP will forward rest of this connection traffic to server directly.
Standard + Hardware SYN Cookie
Fig17. Standard + Hardware SYN Cookie
The main difference in this case is that for Standard virtual server BIG-IP must act as a TCP proxy between client and server during all connection time. This means that BIG-IP sends ACK as response to PSH packet sent by client before this PSH is in fact received by the server. This image has the same color scheme as the first image.
13:01:12.268347 IP 10.10.10.10.34522 > 10.10.20.212.80: Flags [.], ack 1, win 14600, options [nop,nop,TS val 1607698719 ecr 1991641654], length 0
13:01:12.268355 IP 10.10.10.10.34522 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 14600, options [nop,nop,TS val 1607698719 ecr 1991641654], length 167: HTTP: GET / HTTP/1.1
Note that SYN sequence number sent by client to BIG-IP is different than the one BIG-IP sends to Server (2828374030 Vs 2348737573). This is because we are using Standard virtual server, so there are two independent TCP connections, one between client and BIG-IP and the second between BigIP and server.
Again, as commented since in this example Hardware SYN Cookie is used we cannot see first two TCP handshake packets in the capture.
Standard + Software SYN Cookie
Fig18. Standard + Software SYN Cookie
Apparently there are not any difference when capturing traffic of a client request when SYN Cookie is activated or disabled in this case. Only difference is that BIG-IP creates a SYN Cookie challenge and it adds it as a sequence number in SYN/ACK, but looking to capture this change is not clearly visible. We need to compare with log and stats to confirm that in fact SYN Cookie is enabled, also depending in config we can check as well TCP options passed to server side. Color scheme here is the same as the second image.
13:32:07.646011 IP 10.10.10.10.34525 > 10.10.20.212.80: Flags [.], ack 1, win 14600, options [nop,nop,TS val 1609553998 ecr 1993497007], length 0
13:32:07.646022 IP 10.10.10.10.34525 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 14600, options [nop,nop,TS val 1609553998 ecr 1993497007], length 167: HTTP: GET / HTTP/1.1
Note that, as in the previous example, SYN sequence number sent by client to BIG-IP is different than the one BIG-IP sends to Server (3344434108 Vs 2235159701).
Conclusion
At this point only one part left to have a complete picture of BIG-IP's SYN Cookie countermeasure functioning, so in next article I finish this series giving details about expected logs when SYN Cookie is working in our device.
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SYN Cookie: Troubleshooting tcpdump","id":"message:279426","revisionNum":3,"repliesCount":0,"author":{"__ref":"User:user:56733"},"depth":0,"hasGivenKudo":false,"helpful":null,"board":{"__ref":"Tkb:board:TechnicalArticles"},"conversation":{"__ref":"Conversation:conversation:279426"},"messagePolicies":{"__typename":"MessagePolicies","canPublishArticleOnEdit":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.forums.policy_can_publish_on_edit_workflow_action.accessDenied","key":"error.lithium.policies.forums.policy_can_publish_on_edit_workflow_action.accessDenied","args":[]}},"canModerateSpamMessage":{"__typename":"PolicyResult","failureReason":{"__typename":"FailureReason","message":"error.lithium.policies.feature.moderation_spam.action.moderate_entity.allowed.accessDenied","key":"error.lithium.policies.feature.moderation_spam.action.moderate_entity.allowed.accessDenied","args":[]}}},"contentWorkflow":{"__typename":"ContentWorkflow","state":"PUBLISH","scheduledPublishTime":null,"scheduledTimezone":null,"userContext":{"__typename":"MessageWorkflowContext","canSubmitForReview":null,"canEdit":false,"canRecall":null,"canSubmitForPublication":null,"canReturnToAuthor":null,"canPublish":null,"canReturnToReview":null,"canSchedule":false},"shortScheduledTimezone":null},"readOnly":false,"editFrozen":false,"moderationData":{"__ref":"ModerationData:moderation_data:279426"},"teaser":"","body":"
Introduction
\n
In this troubleshooting article, I will explain what traffic is expected to collect in a tcpdump capture during an ongoing attack. In this way you can compare with your own environment and understand why you see what you see.
\n
Use cases
\n
In this section I will show you the most common SYN Cookie configurations and how they affect to the traffic that reach BIG-IP. For each use case I add a diagram explaining the role of each party, so you can use it as a rerefence when reviewing captures.
\n
Note that, as a rule of thumb, in tcpdump captures you will see only traffic reaching red TMM arrow in diagrams.
\n
FastL4 + Hardware SYN Cookie
\n
\n
Fig15. FastL4 + HW SYN Cookie
\n
\n
When enabling SYN Cookie hardware offloading in FastL4 you must have into account that, regardless if FastL4 profile is configured as EST or SYN for ‘PVA TCP Offload State’ the capture will be similar to the one I paste below.
\n
Also note that colours in captures match with the diagram above, that is, blue (on the left) for client, red (next to blue and green) for BIG-IP and green (on the right) for server.
There are three important things you can observe in above captures:
\n
\n
TCP options are lost in this example. This is because SYN Cookie is offloaded in hardware and for this mode currently only MSS value is trasfered from client side to server side, with some limitations. Check article dedicated to 'Hardware Vs Software' in this article series.
\n
In BIG-IP you cannot see the first two packets of TCP 3WHS (SYN and SYN/ACK). This is because hardware is in charge of validating SYN Cookie, since tcpdump is capturing traffic in TMM you only see last ACK packet.
\n
Also note that SYN sequence number sent by client to BIG-IP is the same than the one BIG-IP sends to Server.
\n
\n
FastL4 + Software SYN Cookie
\n
\n
Fig16. FastL4 + SW SYN Cookie
\n
\n
In this case, although you are using an accelerated profile (FastL4), since software is handling the TCP 3WHS this allows you to see all packets when you run a traffic capture. Blue is on the left, red in the middle, green on the right.
16:31:24.340003 IP 10.10.10.10.34527 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 5840, length 167: HTTP: GET / HTTP/1.1
\n
\n
As it happened in the previous example, BIG-IP does not ACK the HTTP request (PSH) sent by client because a FastL4 profile is being used, what it means that BIG-IP will act as a TCP transparent proxy between server and client. In other words, once correct TCP handshake has done BIG-IP will forward rest of this connection traffic to server directly.
\n
Standard + Hardware SYN Cookie
\n
\n
Fig17. Standard + Hardware SYN Cookie
\n
\n
The main difference in this case is that for Standard virtual server BIG-IP must act as a TCP proxy between client and server during all connection time. This means that BIG-IP sends ACK as response to PSH packet sent by client before this PSH is in fact received by the server. This image has the same color scheme as the first image.
13:01:12.268347 IP 10.10.10.10.34522 > 10.10.20.212.80: Flags [.], ack 1, win 14600, options [nop,nop,TS val 1607698719 ecr 1991641654], length 0
\n
13:01:12.268355 IP 10.10.10.10.34522 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 14600, options [nop,nop,TS val 1607698719 ecr 1991641654], length 167: HTTP: GET / HTTP/1.1
\n
\n
Note that SYN sequence number sent by client to BIG-IP is different than the one BIG-IP sends to Server (2828374030 Vs 2348737573). This is because we are using Standard virtual server, so there are two independent TCP connections, one between client and BIG-IP and the second between BigIP and server.
\n
Again, as commented since in this example Hardware SYN Cookie is used we cannot see first two TCP handshake packets in the capture.
\n
Standard + Software SYN Cookie
\n
\n
Fig18. Standard + Software SYN Cookie
\n
\n
Apparently there are not any difference when capturing traffic of a client request when SYN Cookie is activated or disabled in this case. Only difference is that BIG-IP creates a SYN Cookie challenge and it adds it as a sequence number in SYN/ACK, but looking to capture this change is not clearly visible. We need to compare with log and stats to confirm that in fact SYN Cookie is enabled, also depending in config we can check as well TCP options passed to server side. Color scheme here is the same as the second image.
13:32:07.646011 IP 10.10.10.10.34525 > 10.10.20.212.80: Flags [.], ack 1, win 14600, options [nop,nop,TS val 1609553998 ecr 1993497007], length 0
\n
13:32:07.646022 IP 10.10.10.10.34525 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 14600, options [nop,nop,TS val 1609553998 ecr 1993497007], length 167: HTTP: GET / HTTP/1.1
\n
\n
Note that, as in the previous example, SYN sequence number sent by client to BIG-IP is different than the one BIG-IP sends to Server (3344434108 Vs 2235159701).
\n
Conclusion
\n
At this point only one part left to have a complete picture of BIG-IP's SYN Cookie countermeasure functioning, so in next article I finish this series giving details about expected logs when SYN Cookie is working in our device.
","body@stringLength":"21780","rawBody":"
Introduction
\n
In this troubleshooting article, I will explain what traffic is expected to collect in a tcpdump capture during an ongoing attack. In this way you can compare with your own environment and understand why you see what you see.
\n
Use cases
\n
In this section I will show you the most common SYN Cookie configurations and how they affect to the traffic that reach BIG-IP. For each use case I add a diagram explaining the role of each party, so you can use it as a rerefence when reviewing captures.
\n
Note that, as a rule of thumb, in tcpdump captures you will see only traffic reaching red TMM arrow in diagrams.
\n
FastL4 + Hardware SYN Cookie
\n
\n
Fig15. FastL4 + HW SYN Cookie
\n
\n
When enabling SYN Cookie hardware offloading in FastL4 you must have into account that, regardless if FastL4 profile is configured as EST or SYN for ‘PVA TCP Offload State’ the capture will be similar to the one I paste below.
\n
Also note that colours in captures match with the diagram above, that is, blue (on the left) for client, red (next to blue and green) for BIG-IP and green (on the right) for server.
There are three important things you can observe in above captures:
\n
\n
TCP options are lost in this example. This is because SYN Cookie is offloaded in hardware and for this mode currently only MSS value is trasfered from client side to server side, with some limitations. Check article dedicated to 'Hardware Vs Software' in this article series.
\n
In BIG-IP you cannot see the first two packets of TCP 3WHS (SYN and SYN/ACK). This is because hardware is in charge of validating SYN Cookie, since tcpdump is capturing traffic in TMM you only see last ACK packet.
\n
Also note that SYN sequence number sent by client to BIG-IP is the same than the one BIG-IP sends to Server.
\n
\n
FastL4 + Software SYN Cookie
\n
\n
Fig16. FastL4 + SW SYN Cookie
\n
\n
In this case, although you are using an accelerated profile (FastL4), since software is handling the TCP 3WHS this allows you to see all packets when you run a traffic capture. Blue is on the left, red in the middle, green on the right.
16:31:24.340003 IP 10.10.10.10.34527 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 5840, length 167: HTTP: GET / HTTP/1.1
\n
\n
As it happened in the previous example, BIG-IP does not ACK the HTTP request (PSH) sent by client because a FastL4 profile is being used, what it means that BIG-IP will act as a TCP transparent proxy between server and client. In other words, once correct TCP handshake has done BIG-IP will forward rest of this connection traffic to server directly.
\n
Standard + Hardware SYN Cookie
\n
\n
Fig17. Standard + Hardware SYN Cookie
\n
\n
The main difference in this case is that for Standard virtual server BIG-IP must act as a TCP proxy between client and server during all connection time. This means that BIG-IP sends ACK as response to PSH packet sent by client before this PSH is in fact received by the server. This image has the same color scheme as the first image.
13:01:12.268347 IP 10.10.10.10.34522 > 10.10.20.212.80: Flags [.], ack 1, win 14600, options [nop,nop,TS val 1607698719 ecr 1991641654], length 0
\n
13:01:12.268355 IP 10.10.10.10.34522 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 14600, options [nop,nop,TS val 1607698719 ecr 1991641654], length 167: HTTP: GET / HTTP/1.1
\n
\n
Note that SYN sequence number sent by client to BIG-IP is different than the one BIG-IP sends to Server (2828374030 Vs 2348737573). This is because we are using Standard virtual server, so there are two independent TCP connections, one between client and BIG-IP and the second between BigIP and server.
\n
Again, as commented since in this example Hardware SYN Cookie is used we cannot see first two TCP handshake packets in the capture.
\n
Standard + Software SYN Cookie
\n
\n
Fig18. Standard + Software SYN Cookie
\n
\n
Apparently there are not any difference when capturing traffic of a client request when SYN Cookie is activated or disabled in this case. Only difference is that BIG-IP creates a SYN Cookie challenge and it adds it as a sequence number in SYN/ACK, but looking to capture this change is not clearly visible. We need to compare with log and stats to confirm that in fact SYN Cookie is enabled, also depending in config we can check as well TCP options passed to server side. Color scheme here is the same as the second image.
13:32:07.646011 IP 10.10.10.10.34525 > 10.10.20.212.80: Flags [.], ack 1, win 14600, options [nop,nop,TS val 1609553998 ecr 1993497007], length 0
\n
13:32:07.646022 IP 10.10.10.10.34525 > 10.10.20.212.80: Flags [P.], seq 1:168, ack 1, win 14600, options [nop,nop,TS val 1609553998 ecr 1993497007], length 167: HTTP: GET / HTTP/1.1
\n
\n
Note that, as in the previous example, SYN sequence number sent by client to BIG-IP is different than the one BIG-IP sends to Server (3344434108 Vs 2235159701).
\n
Conclusion
\n
At this point only one part left to have a complete picture of BIG-IP's SYN Cookie countermeasure functioning, so in next article I finish this series giving details about expected logs when SYN Cookie is working in our device.
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