Opened 13 years ago
Closed 10 years ago
#39 closed Bug / Defect (worksforme)
Linux gateway detection does not respect flags
| Reported by: | Samuli Seppänen | Owned by: | |
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| Priority: | major | Milestone: | |
| Component: | Networking | Version: | OpenVPN 2.1.0 / 2.1.1 (Community Ed) |
| Severity: | Not set (select this one, unless your'e a OpenVPN developer) | Keywords: | gateway linux |
| Cc: |
Description (last modified by )
In route.c::get_default_gateway, the /proc/net/route file is examined.
One of the fields is the "FLAGS" field which contiain various status flags about a route. Because OpenVPN does not evaluate the flags field, it may find an invalid gateway entry with (Flags & RTNH_F_DEAD == 0).
At least valid with Kernel-2.4, e.g. "ip r del default" does not delete the entry from /proc/net/route, instead it's marked dead. May be true with Kernel-2.6 also, e.g. with the "dead gateway detection": if 2 gw's with same metric exist, this semi-automatically switches from a dead gw to a functioning one. I presume this is done by marking with Flags, but I haven't checked that.
Change History (4)
comment:1 Changed 13 years ago by
| Description: | modified (diff) |
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comment:2 Changed 10 years ago by
This bug report was filed against a very old OpenVPN version. Can somebody confirm that this is still an issue with latest OpenVPN and Linux kernel versions?
comment:3 Changed 10 years ago by
| Keywords: | gateway linux added |
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comment:4 Changed 10 years ago by
| Resolution: | → worksforme |
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| Status: | new → closed |
No confirmation that this is still valid. Closing, reopen if necessary.
Originally reported to SF.net bug tracker by sven-ola (https://sourceforge.net/users/sven-ola).