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  1. #1
    Join Date
    Dec 2009
    Posts
    12

    Default ARP resolution IP to MAC address

    On Pg No. 332 (CCNA Study Guide Sixth Edition), o/p of arp -a command shows,

    c:\>arp -a
    Interface: 172.16.10.2 --- 0x3
    Internet Address Physical Address Type
    172.16.10.1 00-15-05-06-31-b0 Dynamic

    On Pg No. 334, o/p of sh ip arp command shows,

    Lab_A#sh ip arp
    Protocol Address Age(min) Hardware Addr Type Interface
    Internet 172.160.20.1 - 00d0.58ad.05f4 ARPA Ethernet0
    Internet 172.160.20.2 3 0030.9492.a5dd ARPA Ethernet0
    Internet 172.160.10.1 - 00d0.58ad.06aa ARPA Ethernet0
    Internet 172.160.10.2 12 0030.9492.a4ac ARPA Ethernet0

    Now, why does resolution of IP address 172.16.10.1 show two different MAC addresses in ARP cache table of router & host. I mean arp -a shows 00-15-05-06-31-b0 as Physical Address & sh ip arp shows 00d0.58ad.06aa as Hardware Address?

    Or should I ask whether Physical Address & Hardware Address are two different entities? and if at all they are, how they differ?


    * Trivial question - Why notation of Hardware address & Physical address (. dot / - Hyphen notation and grouping of digits) are different???

  2. #2
    Join Date
    Oct 2009
    Posts
    166

    Default

    Quote Originally Posted by vinchez View Post
    On Pg No. 332 (CCNA Study Guide Sixth Edition), o/p of arp -a command shows,

    c:\>arp -a
    Interface: 172.16.10.2 --- 0x3
    Internet Address Physical Address Type
    172.16.10.1 00-15-05-06-31-b0 Dynamic

    On Pg No. 334, o/p of sh ip arp command shows,

    Lab_A#sh ip arp
    Protocol Address Age(min) Hardware Addr Type Interface
    Internet 172.160.20.1 - 00d0.58ad.05f4 ARPA Ethernet0
    Internet 172.160.20.2 3 0030.9492.a5dd ARPA Ethernet0
    Internet 172.160.10.1 - 00d0.58ad.06aa ARPA Ethernet0
    Internet 172.160.10.2 12 0030.9492.a4ac ARPA Ethernet0

    Now, why does resolution of IP address 172.16.10.1 show two different MAC addresses in ARP cache table of router & host. I mean arp -a shows 00-15-05-06-31-b0 as Physical Address & sh ip arp shows 00d0.58ad.06aa as Hardware Address?

    Or should I ask whether Physical Address & Hardware Address are two different entities? and if at all they are, how they differ?


    * Trivial question - Why notation of Hardware address & Physical address (. dot / - Hyphen notation and grouping of digits) are different???


    I think there could be some mistake becoz of which its differ in router arp cache and pc's. if not then toad can tell you whats wrong why it is differ

    and second thing cisco likes show the MAC address in a group of four digits that is why it showing like this
    00d0.58ad.06aa where as a windows PC shows in a group of two digits!!
    Thanks
    Pramod

  3. #3
    Join Date
    Dec 2009
    Posts
    12

    Default ARP resolution IP to MAC address Pg No. 332

    Thanks Pramod for your reply.


    Mr. Todd Lammle or any expert, need ur help.

    Best Regards,
    Vinchez

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