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  1. Senior Member
    Join Date
    Mar 2010
    Posts
    169
    #1

    Default "ip address"/"ip unnumbered" for Tunnel interface

    I have a following tunnel interface configuration:

    Code:
    C1841#sh run int tu0
    Building configuration...
    
    Current configuration : 153 bytes
    !
    interface Tunnel0
     ip address 8.8.8.8 255.255.255.0
     keepalive 5 3
     tunnel source FastEthernet0/0
     tunnel destination 10.10.10.1
     tunnel checksum
    end
    
    C1841#
    Am I correct that IP address 8.8.8.8 is used as a source IP address in the GRE encapsulated IP header only in case the packet is originated from the C1841 router itself?
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  2. Senior Member
    Join Date
    Sep 2008
    Location
    Sweden
    Posts
    392

    Certifications
    CCNP R&S, MCSE 2000, MCTS-640, CCNA:Sec
    #2
    I would assume so (unless you're doing NAT/PAT of course)

    How does ip unnumbered enter into this?
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