# Multi-Channel Feature - Detailed Design Document

## 1. Overview

SMB3 Multi-Channel enables the use of multiple network connections between client and server, providing increased throughput, network fault tolerance, and automatic failover capabilities. This feature aggregates bandwidth across multiple NICs and provides seamless failover when network paths fail.

## 2. Protocol Specification Reference

nonzero coeff to add in. if aNaf[i] > 0 { v.fromP1xP1(tmp1) aTable.SelectInto(multA, aNaf[i]) tmp1.Add(v, multA) } else if aNaf[i] < 0 { v.fromP1xP1(tmp1) aTable.SelectInto(multA, -aNaf[i]) tmp1.Sub(v, multA) } if bNaf[i] > 0 { v.fromP1xP1(tmp1) basepointNafTable.SelectInto(multB, bNaf[i]) tmp1.AddAffine(v, multB) } else if bNaf[i] < 0 { v.fromP1xP1(tmp1) basepointNafTable.SelectInto(multB, -bNaf[i]) tmp1.SubAffine(v, multB) } tmp2.FromP1xP1(tmp1) } v.fromP2(tmp2) return v } golang.org/fips140@v1.0...

                        };
                      }
                    })
                .iterator());
    assertEquals(0, multi.skip(-1));
    assertEquals(0, multi.skip(-1));
    assertEquals(0, multi.skip(0));
    ByteStreams.skipFully(multi, 20);
    assertEquals(20, multi.read());
  }

  public void testReadSingle_noStackOverflow() throws IOException {
    // https://github.com/google/guava/issues/2996

        // This should fail because localhost doesn't support SMB multi-channel
        // but the method should not throw NullPointerException
        try {
            method.invoke(multiChannelManager, localhost, loopback);
            // If it doesn't throw, that's unexpected for localhost
            fail("Expected CIFSException for localhost multi-channel attempt");
        } catch (java.lang.reflect.InvocationTargetException e) {

- Update `Smb2CreateRequest/Response` for durable contexts

---

### Phase 3: Multi-Channel Support
**Priority: MEDIUM** | **Estimated Effort: 5-6 weeks**

Multi-channel enables using multiple network connections for improved performance and reliability.

#### 3.1 Core Multi-Channel Infrastructure
```
Package: jcifs.internal.smb2.multichannel

        discoverLocalInterfaces();

        // Enable multi-channel if we have multiple usable interfaces
        if (canEnableMultiChannel()) {
            multiChannelEnabled = true;
            establishAdditionalChannels();
            log.info("Multi-channel enabled with {} channels", channels.size());
        }
    }

    /**
     * Check if multi-channel is enabled
     *
     * @return true if enabled

import jcifs.internal.smb2.ServerMessageBlock2Request;
import jcifs.smb.SmbSessionInternal;
import jcifs.smb.SmbTransportInternal;

/**
 * Unit tests for SMB3 Multi-Channel functionality
 *
 * These tests verify the multi-channel implementation without requiring a real SMB server.
 */
@ExtendWith(MockitoExtension.class)
@MockitoSettings(strictness = Strictness.LENIENT)
class MultiChannelIntegrationTest {

## Cloud Scale Deployment

        return item

    @app.get("/items/")
    def read_items() -> list[Item]:
        return [
            Item(
                name="Portal Gun",
                description="Device to travel through the multi-rick-verse",
                sub=SubItem(subname="subname"),
            ),
            Item(name="Plumbus"),
        ]

    @app.post("/with-computed-field/")
    def create_with_computed_field(

            // This test mainly verifies that apply goal can modify files
        }
    }

    @Nested
    @DisplayName("Multi-module Projects")
    class MultiModuleTests {

        @Test
        @DisplayName("should handle multi-module project structure")
        void shouldHandleMultiModuleProject() throws Exception {
            // Create parent POM