Hello, Strange behavior observed - and I am not sure, but it seems to be Cisco related.. Got router 1750, on one of the interface I have Cisco switch (1900) connected; to the switch there are connected: hp notebook, and rs/6000 server (aix machine). Both of them have IPs from same subnet (192.168.0.0/255.255.255.0). Behavior I mentioned is:
- I am telneting to the router
- From the router I may ping notebook (always) and aix (but only from time to time)
- If I may ping aix from the router, I may also telnet to this machine; If I may not I have to.. ping aix machine from the notebook, and after that I may ping/telnet to the aix machine from the router as well. To summarize - I may always ping/telnet to the aix machine from the notebook, but not always from the router; If I cannot ping/telnet to the aix machine from the router, I have to ping/telnet to the aix from the notebook, and after that (no matter if I stay connected or not) I will be able - during short time - ping/telnet to the aix machine also from the router.. few minutes later aix is 'blocked' again, and all the show needs to be started from the beginning :( Can anybody help? To answer first auestion :) yes, I have tested other ethernet cable, yes, I have checked other switch port, and no, it made no difference :( My config is below. Thanks for any suggestion. regards Tomasz
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cisco#sh runn Building configuration...
Current configuration : 1540 bytes ! version 12.3 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname cisco ! boot-start-marker boot-end-marker ! logging buffered 8129 debugging enable secret 5 $1$WrSd$rtdJ007MsUbHAM762laAE/ enable password xxx ! memory-size iomem 25 no aaa new-model ip subnet-zero ! ! ! ip dhcp pool local network 192.168.0.0 255.255.255.128 domain-name xxx.xxx dns-server 213.46.172.36 default-router 192.168.0.1 lease 7 ! ip dhcp pool aix host 192.168.0.10 255.255.255.0 client-identifier 0108.005a.93b5.06 dns-server 213.46.172.36 default-router 192.168.0.1 lease 7 ! ! no ip domain lookup ip cef no scripting tcl init no scripting tcl encdir ! ! ! ! interface Ethernet0 mac-address 0014.3815.4170 ip address dhcp ip nat outside half-duplex ! interface FastEthernet0 description connected to EthernetLAN ip address 192.168.0.1 255.255.255.0 ip nat inside speed auto half-duplex ! interface Serial0 no ip address shutdown no cdp enable ! ip nat inside source list 1 interface Ethernet0 overload ip nat inside source static tcp 192.168.0.10 23 interface Ethernet0 32 ip nat inside source static tcp 192.168.0.251 80 interface Ethernet0 52 ip classless no ip http server ! ! no logging trap access-list 1 permit 192.168.0.0 0.0.0.255 snmp-server community public RO snmp-server enable traps tty ! control-plane ! ! line con 0 exec-timeout 0 0 password xxx login line aux 0 line vty 0 4 exec-timeout 0 0 password xxx login ! ! end
cisco#