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Maniphest T3366

tunnel: can not change local / remote ip address for gre-bridge tunnel
Closed, ResolvedPublicBUG
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Description

set interfaces tunnel tun10 local-ip 172.18.254.202
set interfaces tunnel tun10 remote-ip 172.18.254.201
set interfaces tunnel tun10 encapsulation gre-bridge
set interfaces tunnel tun10 address 192.0.2.1/30
commit
$ ip -d link show tun10
11: tun10@NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1476 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
    link/ether 1e:79:b5:00:6b:09 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 0
    gretap remote 172.18.254.201 local 172.18.254.202 ttl inherit addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535

Now change the tunnels remote IP address:
set interfaces tunnel tun10 remote-ip 172.18.254.203

$ ip -d link show tun10
11: tun10@NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1476 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
    link/ether 1e:79:b5:00:6b:09 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 0
    gretap remote 172.18.254.201 local 172.18.254.202 ttl inherit addrgenmode none numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535

The problem is b/c the GRETapIf class states:

# GreTap also called GRE Bridge
class GRETapIf(_Tunnel):
    ...
    def change_options(self):
        pass

Thus the change is simply skipped. The reason is - the OS (Linux) Kernel does not support changing gretap tunnel interfaces parameters at all. A workaround will be to simply create and destroy the tunnel automatically.

Workaround: Remove and re-add tunnel by hand.

Details

Difficulty level
Easy (less than an hour)
Version
1.3.0-rc1
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)

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Event Timeline

c-po changed the task status from Open to In progress.Feb 27 2021, 2:58 PM
c-po claimed this task.
c-po triaged this task as Low priority.
c-po created this task.
c-po updated the task description. (Show Details)
c-po added a parent task: T2028: Convert "interfaces tunnel" to new XML/Python representation.
c-po added a comment.Feb 27 2021, 3:49 PM

This is not applicable to VyOS 1.4 because of T3364.

c-po moved this task from Need Triage to In Progress on the VyOS 1.3 Equuleus board.Feb 27 2021, 3:49 PM
c-po closed this task as Resolved.Feb 27 2021, 9:48 PM
pasik added a subscriber: pasik.Feb 27 2021, 11:43 PM
c-po moved this task from In Progress to Finished on the VyOS 1.3 Equuleus board.Mar 18 2021, 4:28 PM
SrividyaA set Issue type to Bug (incorrect behavior).Aug 31 2021, 1:42 PM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.0); removed VyOS 1.3 Equuleus.Aug 29 2022, 12:17 PM
syncer moved this task from Need Triage to Finished on the VyOS 1.3 Equuleus (1.3.0) board.