Hi everybody,
Please consider following scenarios:
CASE1
Host)10.10.10.10/24----10.10.10.1/24 F1 SRX F2 /1.1.1.1/24---1.1.1.2/24 PE-Internet
Above we are using STATIC NAT, so whenever Host 10.10.10.10 talks to someone across Internet, SRC IP 10.10.10.10 is replaced by 199.199.199.1.
Similarly, all traffic from Internet arriving on F2 on SRX destined to 199.199.199.1, have their destination IP replaced with 10.10.10.10
In above scenario, we do not need enable proxy arp for 199.199.199.1 under F2, because we will never receive ARP request for 199.199.199.1 from PE, because as far as PE is concerned 199.199.199.1 lies behind 1.1.1.1 since PE does not see 199.199.199.1 as directly connected so it will not send any ARP for 199.199.199.1
Am I correct?
CASE2:
Host)10.10.10.10/24----10.10.10.1/24 F1 SRX F2 /1.1.1.1/24---1.1.1.2/24 PE-Internet
Above we are using STATIC NAT, all traffic from 10.10.10.10 destined to Internet, will have SRC IP 10.10.10.10 replaced by 1.1.1.3.
Similarly all traffic from Internet, arriving on F2, destined to 1.1.1.3 will have DEST IP replaced by 10.10.10.10
For this case, we have to enable proxy ARP for 1.1.1.3 as PE sees 1.1.1.3 directly connected thus will send ARP for 1.1.1.3 if it receives any packet for 1.1.1.3
Am I correct?
Thanks and have a good day!!!