Bug #8115
closed
After update 2.3.4_1-> 2.4.0 ospf over gre looks broken
0%
Description
#
#site1 ( 2.3.4_1 )
logs
Nov 4 09:47:58 ospfd 45632 Packet[DD]: Neighbor 10.10.10.18 MTU 1400 is larger than [gre1:10.10.10.25]'s MTU 1376
Nov 4 09:47:53 ospfd 45632 Packet[DD]: Neighbor 10.10.10.18 MTU 1400 is larger than [gre1:10.10.10.25]'s MTU 1376
Nov 4 09:47:48 ospfd 45632 Packet[DD]: Neighbor 10.10.10.18 MTU 1400 is larger than [gre1:10.10.10.25]'s MTU 1376
Nov 4 09:47:43 ospfd 45632 Packet[DD]: Neighbor 10.10.10.18 MTU 1400 is larger than [gre1:10.10.10.25]'s MTU 1376
#site2 ( updated to 2.4.0 ) <- ospf broken
#route
10.10.10.25 link#12 UH 2322 1376 gre2
#logs site2
Nov 4 16:50:04 ospfd 52879 *** sendmsg in ospf_write failed to 224.0.0.5, id 0, off 0, len 64, interface gre2, mtu 1400: Permission denied
It looks like site2 after upgrade it not sending correct MTU info to it peer on site1
GRE header ignored may be .
#After rollback from 2.4.0 to 2.3.4 all working as expected.
site1 site2
-----------IPSEC transport mode----------------------
|--------GRE------------------------
ospf stuck in exstart
|----------GRE----------------------
-----------IPSEC transport mode----------------------
MTU is 1400 on GRE Interface
Again with version 2.3.4_1 on both sites all working as expected
Let me know , if more details needed
Updated by Konstantin Pobudzey about 7 years ago
Sorry picture broken . GRE tunnel inside IPSEC
Updated by Wagner Sartori Junior about 7 years ago
same here. GRE under ipsec. I setup a cronjob every minute correcting the mtu when needed, my tunnels are up now. I'm running 2.4.2.
Updated by Konstantin Pobudzey about 7 years ago
Hi Wagner .Could you advice on exact cronjob workaround ?
Updated by Wagner Sartori Junior about 7 years ago
In my case:
/bin/sh -c "if ! ifconfig gre1 | grep 'mtu 1410' > /dev/null ; then ifconfig gre1 mtu 1410 ; fi"
Updated by Konstantin Pobudzey almost 7 years ago
workaround was :
MTU settings for GRE interfaces
new 2.4 version MTU 1376
old 2.3.4 version MTU 1400
in this case
old<--> old <--working
old<--> new <--working
new<--> new <--working
Possibly 2.3.4 version is more broken ( or have different logic for MTU settings )
1) 2.3.4 GUI settings for GRE interface MTU 1400 --> produced 1376 for ifconfig output
gre0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1376
options=80000<LINKSTATE>
2) 2.4.0-2 GUI settings for GRE interface MTU 1376 --> produced 1376 for ifconfig output
gre0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1376
options=80000<LINKSTATE>
Updated by Jim Pingle over 5 years ago
- Project changed from pfSense to pfSense Packages
- Category set to FRR
- Status changed from New to Duplicate
Duplicate of #9204