syslog udp session keep alive ?

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

syslog udp session keep alive ?

L0 Member

 

When forwarding logs, they are being sent to udp 514. The udp time out is 30 seconds, and the syslog server actually receives packets every 5 seconds. However, I wonder why the firewall keeps the session longer than 30 seconds. When the time is long, it is several minutes or hours, and sometimes the date passes.

 

 

스크린샷 2022-12-29 오후 2.34.03.png스크린샷 2022-12-29 오후 2.34.50.png

2 REPLIES 2

Cyber Elite
Cyber Elite

Hello,

Its because they are UDP packets/sessions. Here is an article from Palo Alto on this:

 

When monitoring the traffic logs using  Monitor > logs > Traffic, some traffic is seen with the Session End Reason  as aged-out.  Any traffic that uses UDP or ICMP is seen will have session end reason as aged-out in the traffic log. This is because unlike TCP, there is there is no way for a graceful termination of UDP session and so aged-out is a legitimate session-end reason for UDP (and ICMP) sessions. 

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PMjLCAW

Regards,

 

L7 Applicator

If you add "From port", "Packets sent" and "Packets received" columns you can see that until syslog sender is sending traffic from same source port Palo keeps same session open and packets are gathered under same session. 

If no new packets in this session for 30 seconds then this session is closed.

 

Enterprise Architect, Security @ Cloud Carib Ltd
ACE, PCNSE, PCNSI
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!