Mailing List Archive: ipip and gre interfaces

ipip and gre interfaces

Nov 24, 2002, 7:49 AM

Post #1 of 3 (1845 views)

I have two upstream STM-1's to two different upstream ISP's connected to two
M5's located in different POPs and two local E3's connecting the M5's. I'd
like to somehow backup the E3's in case they fail (they are going through the
same telco). I thought I'd build a tunnel between the two STM-1's in case the
E3 fails. I don't have a tunnel PIC in any of my M5's and don't want to get on
just to build this tunnel (it would probably be cheaper to move one of the
E3's to another telco and get redundancy this way, which is what I'll
probably eventually do).

What is the usefulness of the ipip and gre interfaces (not the gr-x/x/x and
ip-x/x/x interfaces you get when you have a tunnel PIC)? I successfuly built a
tunnel between the M5's with the ipip interface and can ping the other side
through the tunnel, but trying to route through the tunnel I get a network
unreachable for every packet. Configuration was something like

interfaces {
ipip {
unit 0 {
tunnel {
source 192.168.1.1;
destination 192.168.2.1;
}
family inet {
address x.x.x.x/30;
}
}
}
}

... and the opposite on the other side.

Is the usage of those ipip and gre interfaces documented anywhere? I wasn't
able to find any documentation on them.

Any help will be appreciated.

ipip and gre interfaces [ In reply to ]

jesper at skriver

Nov 24, 2002, 10:21 AM

Post #2 of 3 (1767 views)

Permalink

On Sun, Nov 24, 2002 at 04:49:42PM +0100, Blaz Zupan wrote:
> I have two upstream STM-1's to two different upstream ISP's connected to two
> M5's located in different POPs and two local E3's connecting the M5's. I'd
> like to somehow backup the E3's in case they fail (they are going through the
> same telco). I thought I'd build a tunnel between the two STM-1's in case the
> E3 fails. I don't have a tunnel PIC in any of my M5's and don't want to get on
> just to build this tunnel (it would probably be cheaper to move one of the
> E3's to another telco and get redundancy this way, which is what I'll
> probably eventually do).
>
> What is the usefulness of the ipip and gre interfaces (not the gr-x/x/x and
> ip-x/x/x interfaces you get when you have a tunnel PIC)? I successfuly built a
> tunnel between the M5's with the ipip interface and can ping the other side
> through the tunnel, but trying to route through the tunnel I get a network
> unreachable for every packet. Configuration was something like
>
> interfaces {
> ipip {
> unit 0 {
> tunnel {
> source 192.168.1.1;
> destination 192.168.2.1;
> }
> family inet {
> address x.x.x.x/30;
> }
> }
> }
> }
>
> ... and the opposite on the other side.
>
> Is the usage of those ipip and gre interfaces documented anywhere? I wasn't
> able to find any documentation on them.
>
> Any help will be appreciated.

My experience is that gre is only usefull for routing-engine sourced
traffic, just as the fxp0 interface is.

So it cannot be used for user traffic.

/Jesper

--
Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456
Senior network engineer @ AS3292, TDC Tele Danmark

One Unix to rule them all, One Resolver to find them,
One IP to bring them all and in the zone to bind them.

ipip and gre interfaces [ In reply to ]

chris at cattle-today

Nov 24, 2002, 5:09 PM

Post #3 of 3 (1782 views)

Permalink

Blaz,

You are going to have to spring for the tunnel PIC if you want route across the tunnel interface.

Chris

--- Blaz Zupan <blaz@inlimbo.org> wrote:
>I have two upstream STM-1's to two different upstream ISP's connected to two
>M5's located in different POPs and two local E3's connecting the M5's. I'd
>like to somehow backup the E3's in case they fail (they are going through the
>same telco). I thought I'd build a tunnel between the two STM-1's in case the
>E3 fails. I don't have a tunnel PIC in any of my M5's and don't want to get on
>just to build this tunnel (it would probably be cheaper to move one of the
>E3's to another telco and get redundancy this way, which is what I'll
>probably eventually do).
>
>What is the usefulness of the ipip and gre interfaces (not the gr-x/x/x and
>ip-x/x/x interfaces you get when you have a tunnel PIC)? I successfuly built a
>tunnel between the M5's with the ipip interface and can ping the other side
>through the tunnel, but trying to route through the tunnel I get a network
>unreachable for every packet. Configuration was something like
>
>interfaces {
> ipip {
> unit 0 {
> tunnel {
> source 192.168.1.1;
> destination 192.168.2.1;
> }
> family inet {
> address x.x.x.x/30;
> }
> }
> }
>}
>
>... and the opposite on the other side.
>
>Is the usage of those ipip and gre interfaces documented anywhere? I wasn't
>able to find any documentation on them.
>
>Any help will be appreciated.
>
>_______________________________________________
>juniper-nsp mailing list juniper-nsp@puck.nether.net
>http://puck.nether.net/mailman/listinfo/juniper-nsp

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