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Latency Problem with ipsec on ASA 5510

hi guys,

i am a networking guy for many, many years but a newbe to firewalling and ipsec. Currently i am working on an ipsec connection between an ASA 5510 on my side and a fortigate box at another location. Looks fine so far , ipsec is established in tranport mode. When i ping a server behind the fortigate the pings run fine at first but soon latency starts to increase. When it reaches about 2 sec it suddenly drops back to normal and the whole thing starts again. This repeates to infinity .... The same happens the other way round.

Any Ideas what might cause this behaviour ?

Thanks in advance

mifuc

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Accepted Solutions

Latency Problem with ipsec on ASA 5510

Hi Bro

Even your continous PING is random, I guess this isn't a MTU issue. I would love to blame Fortigate FW for this, as I hate non-Cisco products but then again you might never know, it could be the Cisco ASA 5510 that's causing this. I'm assuming your Internet/WAN connection is good. Perhaps, this Cisco document maybe of help https://supportforums.cisco.com/docs/DOC-4971

Warm regards, Ramraj Sivagnanam Sivajanam Technical Specialist/Service Delivery Manager – Managed Service Department
2 REPLIES

Latency Problem with ipsec on ASA 5510

Hi Bro

Even your continous PING is random, I guess this isn't a MTU issue. I would love to blame Fortigate FW for this, as I hate non-Cisco products but then again you might never know, it could be the Cisco ASA 5510 that's causing this. I'm assuming your Internet/WAN connection is good. Perhaps, this Cisco document maybe of help https://supportforums.cisco.com/docs/DOC-4971

Warm regards, Ramraj Sivagnanam Sivajanam Technical Specialist/Service Delivery Manager – Managed Service Department
New Member

Latency Problem with ipsec on ASA 5510

Hi Ramraj,

you are right , it was a fortigate problem :-)

everything worked once they updated the fortigate software.

Anyway, thanks for your help

Michael

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