Bug #4154
closedDuplicated PDP context entries
90%
Description
Attached file is the result of
show pdp-context ggsn ggsn0
in the vty.
Many duplicate entries can be observed. IMSIs have been changed to XXX, except the last three digits
Files
Related issues
Updated by pespin over 4 years ago
- Status changed from New to In Progress
- Do we have a timer to clean stalled pdp ctx in osmo-ggsn?
- Is recovery procedure in osmo-ggsn working fine when osmo-sgsn crashes? (and is osmo-sgsn sending an increased counter after restarting from a crash?)
- IP addresses are duplicated: it means ippool side was freed while pdp ctx was kept alive?
keith, Can you share your osmo-ggsn config?
I submitted following patch which would be great to use when trying to reproduce the issue:
https://gerrit.osmocom.org/c/osmo-ggsn/+/15248 ggsn_vty.c: Fix wrong use of in46a_from_eua, print IPv6 euas
Updated by pespin over 4 years ago
BTW, in IPv4v6 APNs it is expected that PDP ctx appear repeated once if they have both an IPv4 and IPv6 address:
/* show all (active) PDP contexts within an APN */ static void apn_show_pdp_contexts(struct vty *vty, struct apn_ctx *apn) { ippool_show_pdp_contexts(vty, apn->v4.pool); ippool_show_pdp_contexts(vty, apn->v6.pool); }
Updated by keith over 4 years ago
ggsn ggsn0 gtp state-dir /tmp gtp bind-ip 10.23.0.20 apn internet gtpu-mode tun tun-device tun4 type-support v4 ip prefix dynamic 172.22.0.0/16 ip dns 0 172.22.0.1 ip dns 1 67.207.67.2 ip ifconfig 172.22.0.1/16 no shutdown apn inet6 gtpu-mode tun tun-device tun6 type-support v6 ipv6 prefix dynamic 2001:780:44:2000:0:0:0:0/56 ipv6 dns 0 2001:4860:4860::8888 ipv6 dns 1 2001:4860:4860::8844 ipv6 ifconfig 2001:780:44:2000:0:0:0:0/56 shutdown apn inet46 gtpu-mode tun tun-device tun46 type-support v4v6 ip prefix dynamic 176.16.46.0/24 ip dns 0 192.168.100.1 ip dns 1 8.8.8.8 ip ifconfig 176.16.46.0/24 ipv6 prefix dynamic 2001:780:44:2100:0:0:0:0/56 ipv6 dns 0 2001:4860:4860::8888 ipv6 dns 1 2001:4860:4860::8844 ipv6 ifconfig 2001:780:44:2100:0:0:0:0/56 shutdown default-apn internet no shutdown ggsn
Updated by pespin over 4 years ago
Duplication explained above (v4v6 APNs) should be fixed by:
https://gerrit.osmocom.org/c/osmo-ggsn/+/15253 ggsn_vty.c: Avoid printing duplicates for pdp context with v4v6 EUAs
So in your case (after looking at your config file) it seems all duplication happen on "internet", which is an IPv4-only APN.
Can you make sure in your operations when osmo-sgsn or osmo-ggsn crashes you don't remove the gsn_restart file and can you make sure that number increases after a crash?
Updated by pespin over 4 years ago
I submitted some more commits to have more information in VTY "show pdp-context" related commands.
Regarding timers to drop inactive pdp contexts, there seems to be implementations supporting that (cisco, juniper) but I cannot find any information in specs:
https://www.cisco.com/c/en/us/td/docs/ios/12_2/12_2y/12_2yy/ggsn31/31cfg/ggsn31_c/ggsncfg.html
https://www.juniper.net/documentation/en_US/junos-mobility11.2/topics/reference/configuration-statement/idle-timeout-edit-unified-edge-gateways-ggsn-pgw-apn-services-apn.html
Updated by pespin over 4 years ago
- Related to Bug #4161: Implement pdp idle timer added
Updated by pespin over 4 years ago
After watching the logs live in the setup, I have a potential fix for it:
https://gerrit.osmocom.org/c/osmo-ggsn/+/15259 libgtp: announce pdp ctx deletion upon CreatePdpCtx being rejected
And ttcn3 related case:
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/15262
Waiting until keith can give it a try and make sure the issue is fixed.
Updated by pespin over 4 years ago
- Related to Bug #4165: osmo-ggsn: implement echo request against osmo-sgsn added
Updated by pespin over 4 years ago
Once osmo-ggsn.git Id2c84165dc59dff495106758146a701ca488834f is merged (https://gerrit.osmocom.org/c/osmo-ggsn/+/15267), it's time for keith to give a try again and see hoe it behaves.
Updated by keith over 4 years ago
ggsn branch pespin/echo is running on the test machine now.
libgtp, sgsn are nightly.
Updated by pespin over 4 years ago
I guess libgtp in the host running the pespin/echo ggsn is also from pespin/echo? you'll need that one too.
Updated by pespin over 4 years ago
- Assignee changed from pespin to keith
- % Done changed from 0 to 90
Assigning to keith, please provide feedback on current status (with related osmo-ggsn/osmo-sgsn versions).
Updated by keith over 4 years ago
- File ggsn-pdp-EUA.txt ggsn-pdp-EUA.txt added
I will compile from the merged patches and run master now. Just before restarting the GGSN I thought I would capture this current output (attached), as it would seems to confirm that we are now also recycling the IP pool correctly.
Updated by keith over 2 years ago
- Status changed from Feedback to Closed
- Assignee deleted (
keith)
Closing, too old.