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Results tagged with gre
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user 8499
Generic Routing Encapsulation is a tunnelling protocol, used to carry network layer protocols through encapsulation inside others.
2
votes
GRE Source IP Spoofing
The original RFC 1701 GRE allows for a sequence number, and attacker in the situation you describe would need to know what that is. TCP has something similar with a sequence number. … The following RFC 2784 GRE eliminated the sequence number, but it was updated by RFC 2890, Key and Sequence Number Extensions to GRE that specifies a key and sequence number for GRE that would be necessary …
- 101k
0
votes
Accepted
Is a GRE tunnel sensitive to packet loss?
A tunnel itself is just wrapping packets inside an outer packet as the payload of the outer packet. If the link which the tunnel packets cross is losing traffic, having a tunnel is no better than not …
- 101k
1
vote
Cisco IPSec questions on loopback0 and phase 2
There are many reasons for having a loopback interface. Primarily,
loopback interfaces never go down. This is useful for things like
routing protocols or tunnels that may have more than one way into …
- 101k
1
vote
Accepted
Site-to-Site VPN tunnel configuration
You could use a GRE tunnel inside that type of tunnel to overcome this, or use a different tunnel type that supports the features you need to support. …
- 101k
2
votes
Splitting Data and Voice by creating GRE tunnel for Data, using overhead for Voice
You are going to need a router on each end of the link if you use GRE. In that case, you should use layer-3 links. …
- 101k
2
votes
Accepted
Why specify the source tunnel address?
Often, you may want to use a loopback, since it will never go down, as the source because you may have a backup path to the other end. It is not always the right thing to do to use the exit interface …
- 101k
0
votes
Accepted
How would "looping" in GRE occur according to RFC 2784
If the de-encapsulating router has a route for the un-encapsulated destination address going back to the encapsulating router, you will get a loop that only expires when the TTL expires. This is an en …
- 101k
0
votes
Accepted
More Fragment flag and Frag Offset field after GRE fragmentation
each fragment within a complete GRE header and GRE
delivery header. … When the GRE egress node receives a GRE delivery packet fragment,
it silently discards the fragment without attempting to reassemble
the GRE delivery packet to which the fragment belongs. …
- 101k
1
vote
Network Security Tunnel
FYI, GRE is not secure. You would need to use a tunnel that does encryption for a secure tunnel. …
- 101k
1
vote
Can a VPN tunnel between routers be built with different tunnel protocol on both ends?
GRE inside IPsec. …
- 101k