* Force a specific IP for outgoing WG traffic with SNAT?
@ 2023-02-16 19:07 Roman Mamedov
2023-03-17 19:43 ` Ashish SHUKLA
0 siblings, 1 reply; 3+ messages in thread
From: Roman Mamedov @ 2023-02-16 19:07 UTC (permalink / raw)
To: wireguard
Hello,
I'm trying to move all my WG communication with peers to a non-primary IP of my server.
It has IPs added like this:
inet6 2001:db8::ca6c/128 scope global deprecated
valid_lft forever preferred_lft 0sec
inet6 2001:db8::1/128 scope global nodad
valid_lft forever preferred_lft forever
What I tried:
ip6tables -t nat -I POSTROUTING -d 2000::/3 -p udp --dport 51820 -j SNAT --to-source 2001:db8::ca6c
Also tried to filter by --sport, and also briefly without a port filter at all.
This has zero effect, as shown by tcpdump all the WG traffic still originates from 2001:db8::1
Does anyone have an idea why is that? Thanks
--
With respect,
Roman
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Force a specific IP for outgoing WG traffic with SNAT?
2023-02-16 19:07 Force a specific IP for outgoing WG traffic with SNAT? Roman Mamedov
@ 2023-03-17 19:43 ` Ashish SHUKLA
2023-03-17 19:54 ` Roman Mamedov
0 siblings, 1 reply; 3+ messages in thread
From: Ashish SHUKLA @ 2023-03-17 19:43 UTC (permalink / raw)
To: Roman Mamedov; +Cc: wireguard
On 2023-02-17 00:37, Roman Mamedov wrote:
> Hello,
>
> I'm trying to move all my WG communication with peers to a non-primary
> IP of my server.
>
> It has IPs added like this:
>
> inet6 2001:db8::ca6c/128 scope global deprecated
> valid_lft forever preferred_lft 0sec
> inet6 2001:db8::1/128 scope global nodad
> valid_lft forever preferred_lft forever
>
> What I tried:
>
> ip6tables -t nat -I POSTROUTING -d 2000::/3 -p udp --dport 51820 -j
> SNAT --to-source 2001:db8::ca6c
>
> Also tried to filter by --sport, and also briefly without a port filter
> at all.
>
> This has zero effect, as shown by tcpdump all the WG traffic still
> originates from 2001:db8::1
>
> Does anyone have an idea why is that? Thanks
Did you try filtering based on fwmark ?
CONFIGURATION FILE FORMAT
The configuration file format is based on INI. There are two
top level sections -- Interface and Peer. Multiple Peer sections may be
specified, but only one Interface section may be specified.
The Interface section may contain the following fields:
• PrivateKey — a base64 private key generated by wg
genkey. Required.
• ListenPort — a 16-bit port for listening. Optional; if
not specified, chosen randomly.
• FwMark — a 32-bit fwmark for outgoing packets. If set
to 0 or "off", this option is disabled. May be specified in hexadecimal
by prepending "0x". Optional.
HTH
--
Ashish
"It could be that the purpose of your life is only to serve as a warning
to others." (Ashleigh Brilliant)
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Force a specific IP for outgoing WG traffic with SNAT?
2023-03-17 19:43 ` Ashish SHUKLA
@ 2023-03-17 19:54 ` Roman Mamedov
0 siblings, 0 replies; 3+ messages in thread
From: Roman Mamedov @ 2023-03-17 19:54 UTC (permalink / raw)
To: Ashish SHUKLA; +Cc: wireguard
On Sat, 18 Mar 2023 01:13:53 +0530
Ashish SHUKLA <ashish.is@lostca.se> wrote:
> Did you try filtering based on fwmark ?
>
> CONFIGURATION FILE FORMAT
> The configuration file format is based on INI. There are two
> top level sections -- Interface and Peer. Multiple Peer sections may be
> specified, but only one Interface section may be specified.
>
> The Interface section may contain the following fields:
>
> • PrivateKey — a base64 private key generated by wg
> genkey. Required.
>
> • ListenPort — a 16-bit port for listening. Optional; if
> not specified, chosen randomly.
>
> • FwMark — a 32-bit fwmark for outgoing packets. If set
> to 0 or "off", this option is disabled. May be specified in hexadecimal
> by prepending "0x". Optional.
I was not aware there was such an option. For now the task described in the
original message is no longer required, I will try fwmark next time when it
might be. Thanks!
--
With respect,
Roman
^ permalink raw reply [flat|nested] 3+ messages in thread
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