https://osmocom.org/https://osmocom.org/favicon.ico?16647414092019-04-09T11:21:46ZOpen Source Mobile CommunicationsOsmoSGSN - Bug #3689: Support Cisco GGSN (Cisco 7200 with IOS 12.4.x)https://osmocom.org/issues/3689?journal_id=138482019-04-09T11:21:46Zlaforge
<ul></ul><p>Interesting test / report, I unfortuantely didn't see it until today by accident :/</p>
<p>I think it's actually the Cisco side that's broken if it doesn't accept "optional" IEs but refuses to ignore them?</p>
<p>If we need to work around such issues, the only realistic option I can see is that we have a vty configuration item which allows the user to specify the 3GPP release of the GGSN. This way we can then decide to suppress some of those later IEs on older releases.</p>
<p>Maybe there's also some version information visible in the GTP from the GGSN? I don't recall that part of the GTP specs off my head.</p>