i have got Cisco 1751 router, its an internet router router, below are the configuration of hte router.
memory-size iomem 25
description connected to Internet
ip address 18.104.22.168 255.255.255.252
no ip directed-broadcast
ip nat outside
description connected to EthernetLAN
ip address 192.168.254.1 255.255.255.0 secondary
ip address 22.214.171.124 255.255.255.192
no ip directed-broadcast
ip nat inside
ip nat pool RASROUTER 126.96.36.199 188.8.131.52 netmask 255.255.255.192
ip nat inside source list 1 pool RASROUTER overload
ip route 0.0.0.0 0.0.0.0 Serial0
ip route 192.168.100.192 255.255.255.192 FastEthernet0
no ip http server
access-list 1 permit 192.168.254.10
access-list 1 permit 192.168.100.192 0.0.0.63
line con 0
transport input none
line aux 0
line vty 0 4
no scheduler allocate
Other Dial-up router 2610 is connected to the switch for dial-up users & authentication.
now this configuration is working fine for the past 4 yerars, now sunddenly, for the past 1 week my internet has become very slow, during the day time the CPU process utilization is reaching 99% & i get a message CPUHUG & the memory allocation failure,after restarting the router i get this err. message once in every 20 mins. i havn't done any changes on the network as well as the router config. almost 300 users are connected to internet via 4 gateway Linux machines.(with diff subnet) in the evening hours the internet usage has come low so the accessing internet is normal. but once in every 30minz or 1hr i get err. message memory allocation failure, tried changing 3 routers (1751) still same problem. when ever i get this err, message i can't telnet the router, if i go to console, there i get a message "low memory" so i need to restart the router. so how do i over come with this problem?
since the configuration has been working fine over the last 4 years, most likely you are either suffering from activity from within your network, or possibly an attack from the outside. Can you identify which process is causing the high CPU utilization (with the ´show proc cpu´ exec command) ?
One thing you could try is turning on CEF (´ip cef´ globally).
i seems to see some private IP address on the WAN side, when i spoke to the service provider he says problem would be from my end, but i disconnected the fastethernet cable, traceroute shows towards WAN side. so i thought i will put access-list, but still i get the same, so how do i prevent this? lan users can't able to ping the private IP address residing on WAN, but from router i could able ping the private address which is residng on WAN even after entering the access-list.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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