They have shown in the IRB sample configuration, Network Diagram, PC1 and PC2 have IPs 10.10.10.3/24 & 10.10.10.2/24 respectively. How is that possible on router's interface?
My second is question is altogether a different scenario.
I have two VLAN 1 and VLAN 2. Host from VLAN 1 is connected to one interface of ISR router and host from VLAN 2 is connected to another interface on ISR. I am able to ping from PC1 and PC2.
Now this is because of which behavior of router? Is bridging taking place here or routing? What is exactly happening in side router whn my ping reaches router? Is the VLAN header, MAC header are stripped and new headers are appended to the IP packet?
Assuming both PCs have gateway configured properly, and have the arp entry for gateway.
1,PC1 will send ICMP with destination IP to PC2 and destination MAC to gateway.
2,Router receive this ICMP from vlan1, it will do routing lookup (will be CEF lookup most time, but the concept is same). The destination subnet is a connected route in routing table, the router will route the ICMP to vlan 2, and do L2 rewrite.
3.1,If router has the arp entry for PC2, the router will send out ICMP source IP from PC1, source MAC from vlan 2, destination IP to PC2, destination MAC to PC2.
3.2 if router doesn't have the arp entry for PC2, it will first send ARP to vlan 2 asking who is PC2 tell me your MAC. After it receives the reply, it will follow same process in 3.1.
4. Once receive the packet, PC2 will send ICMP reply back to PC1 with destination IP to PC1, destination MAC to gateway. The ICMP reply packet will follow same steps to reach PC1.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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