i have two wan routers connected to two core switches with cross connection and RTG is OSPF and also i have firewall connected to core switches.
the problem is when users connected to servers via VPN that terminated on the firwall they not facing any slowness issue but if they connected to servers via the wan routers they facing slowness and also kindly find the configuration below,
Why do you have the ip nat commands on routers and switches interfaces?, you have ip nat outside at the switches, and ip nat inside in the routers. So you will have configured something like this :
sw lan intf ip nat inside --- sw wan intf ip nat outside --- router wan intf ip nat inside --- router lan intf ip nat outside
Are you using some kind of double layer nat?. If you area already doing nat in your switches, you dont need this in your wan routers. Or viceversa, you could delete you switches nat configuration and apply this in your routers.
Your nat, wccp or qos configuration in the switch could be the cause of this slowness issue. I suppose you qos configuration is consistently applied in all interfaces.
First check your nat configuration, because if not needed could be the most likely cause. The switch and router have to perform a lookup on every packet in the inside and outside interfaces, looking for a matching translation or nat rule that match on those packets. This will increase processing time, cpu usage, etc. Check your cpu on both routers and switches.
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