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osmo-ttcn3-hacks
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document the purpose of IP addresses used by GGSN tests 

The purpose of the various IP addresses used by our GGSN tests is not
immediately clear. Add documentation based on the current status quo.

Change-Id: I079efcff3dab09d71330625f5b661cd81e42bf38
This commit is contained in:
Stefan Sperling 2018-04-03 16:03:15 +02:00 committed by Harald Welte
parent 6a84b23f25
commit cb782b99ff
1 changed files with 19 additions and 0 deletions
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19
ggsn_tests/GGSN_Tests.ttcn
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@ -20,16 +20,35 @@ module GGSN_Tests {
const integer GTP1U_PORT := 2152;
modulepar {
/* Default IP addresses. May be overridden by GGSN_Tests configuration files. */
/* The SGSN simulated by TTCN3 will bind to these addresses for GTP control and GTP user planes. */
charstring m_bind_ip_gtpc := "127.23.42.1";
charstring m_bind_ip_gtpu := "127.23.42.1";
/* Addresses the GGSN which is being tested is listening on for SGSN connections. */
charstring m_ggsn_ip_gtpc := "127.0.0.6";
charstring m_ggsn_ip_gtpu := "127.0.0.6";
/*
* Our tests expect to see these DNS servers in 'Create PDP context responses' sent by the GGSN.
* These addresses must therefore match 'ip[v6] dns' options configured in osmo-ggsn.conf.
*
* These addresses are not expected to serve actual DNS requests. However, tests may expect to be
* able to ping these addresses (currently, IPv4 addresses must respond with an ICMP 'echo reply',
* and IPv6 addresses may respond with either ICMPv6 'echo reply' or 'destination unreachable').
*/
charstring m_ggsn_ip4_dns1 := "192.168.100.1"
charstring m_ggsn_ip4_dns2 := "8.8.8.8"
charstring m_ggsn_ip6_dns1 := "2001:4860:4860::8888"
charstring m_ggsn_ip6_dns2 := "2001:4860:4860::8844"
/*
* Additional address ranges are defined in osmo-ggsn.conf from which addresses are assigned
* to MS "behind" the simulated SGSN. These addresses appear on tun devices used by osmo-ggsn.
* The tests expect to be able to send ping packets between any two simulated MS within the same
* address range. This requires IP forwarding to be enabled on the corresponding tun interfaces.
*/
}
type set PdpContext {