Current configuration : 109 bytes ! interface FastEthernet0/0.2 encapsulation dot1Q 2 ip unnumbered Loopback0 no snmp trap link-status end
ip route 172.16.1.44 255.255.255.255 FastEthernet0/0.2
All is working fine.
User is configured with 172.16.1.44 sends arp request and GW replies.
BUT WE ALL KNOW THAT ARP REQUESTS AND ROUTING TABLE ARE NOT RELATIVE, ARP REPLY IS SENT BACK TO INTERFACE WHERE IT RECEIVED.
so the question goes: Why user can't change IP to other than STATIC ip route on gateway states. ? I know that internet to user will not wotk because there will be diferent static route pointing to his interface than his 'fake' ip address. BUT WHY USER DOESN'T GET AN ARP REPLY FROM GATEWAY when user is using invalid IP address ? The question is just about ARP. Since we all know that routes and arp processing is different things, why ARP reply is sent when static route to user is the same as the user ip address.. HOW Cisco router knows that he should'nt sent arp reply to user with invalid IP. The error on gw goes:
Re: Ip unnumbered interface ARPs, simple topo - tough question
sometimes is strange, my question was HOW AND WHY IT'S WORKIN/NOT WOKIRNG, if you dont know the answer the topic questions you don't need to post.. why lot of people post answers that you didin't ask..
Ip unnumbered interface ARPs, simple topo - tough question
The subnet mask of the interface is significant for ARP replies.
If the IP address of the requestor falls within the interface's subnet then a reply is appropriate, direct communication using MAC addresses on the local segment is OK. If the requestor's IP address is outside of the interface IP address subnet, then no reply is allowed, because it is assumed the requesting device is not on the local ethernet segment.
A proxy-arp reply may be more appropriate because the router could get the requestor to the destination, but the requested IP address, the GW, is actually directly connected to the router so this also would not be allowed.
BTW, friendly or polite responses get better results.
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