---
name: "ares_set_local_ip4"
section: "3"
platform: "linux"
package: "c-ares"
version: "1.34.9-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/ares_set_local_ip4"
---

# ares\_set\_local\_ip4(3)

Set local IPv4 address outgoing requests.

## NAME

ares\_set\_local\_ip4 - Set local IPv4 address outgoing requests.

## SYNOPSIS

```
#include <ares.h>
void ares_set_local_ip4(ares_channel_t *channel, unsigned int local_ip)
```

## DESCRIPTION

The **ares\_set\_local\_ip4** function sets the IP address for outbound requests.  The parameter *local\_ip* is specified in host byte order.  This allows users to specify outbound interfaces when used on multi-homed systems.

## SEE ALSO

[**ares\_set\_local\_ip6**(3)](/ares_set_local_ip6/3.md)

## NOTES

This function was added in c-ares 1.7.4